Info
- Utilizzare la checkbox di selezione a fianco di ciascun documento per attivare le funzionalità di stampa, invio email, download nei formati disponibili del (i) record.
The chemistry of chlorosulfonyl isocyanate [[electronic resource] /] / Durga Nath Dhar, Preeti Dhar
| The chemistry of chlorosulfonyl isocyanate [[electronic resource] /] / Durga Nath Dhar, Preeti Dhar |
| Autore | Dhar Durga Nath |
| Pubbl/distr/stampa | River Edge, N.J., : World Scientific, c2002 |
| Descrizione fisica | 1 online resource (xvi, 377 p. ) : ill |
| Disciplina | 661.894 |
| Altri autori (Persone) | DharPreeti |
| Soggetto topico |
Isocyanates
Chemistry, Organic Chlorosulfonyl isocyanate |
| Soggetto genere / forma | Electronic books. |
| ISBN | 981-277-702-4 |
| Formato | Materiale a stampa  |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto | Reactions: Alkenes; Dienes; Trienes; Tetraenes; Pentaene; Alcohols; Ketenes; Acetals; Acids; Amides; Oxygen Heterocycles; Heterocycles; Applications: Herbicides; Plant Protection Agents; Pesticides; Insecticides; Anticancer; Analgesics; Neuroleptics; Eye Disorders; Antibiotics; Inhibitors; Antibiotics; Cephem; Liquid Crystals; Textile; and other topics. |
| Record Nr. | UNINA-9910450884403321 |
Dhar Durga Nath
|
||
| River Edge, N.J., : World Scientific, c2002 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
The chemistry of chlorosulfonyl isocyanate [[electronic resource] /] / Durga Nath Dhar, Preeti Dhar
| The chemistry of chlorosulfonyl isocyanate [[electronic resource] /] / Durga Nath Dhar, Preeti Dhar |
| Autore | Dhar Durga Nath |
| Pubbl/distr/stampa | River Edge, N.J., : World Scientific, c2002 |
| Descrizione fisica | 1 online resource (xvi, 377 p. ) : ill |
| Disciplina | 661.894 |
| Altri autori (Persone) | DharPreeti |
| Soggetto topico |
Isocyanates
Chemistry, Organic Chlorosulfonyl isocyanate |
| ISBN | 981-277-702-4 |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto | Reactions: Alkenes; Dienes; Trienes; Tetraenes; Pentaene; Alcohols; Ketenes; Acetals; Acids; Amides; Oxygen Heterocycles; Heterocycles; Applications: Herbicides; Plant Protection Agents; Pesticides; Insecticides; Anticancer; Analgesics; Neuroleptics; Eye Disorders; Antibiotics; Inhibitors; Antibiotics; Cephem; Liquid Crystals; Textile; and other topics. |
| Record Nr. | UNINA-9910785100403321 |
|
Dhar Durga Nath
|
||
| River Edge, N.J., : World Scientific, c2002 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
The chemistry of chlorosulfonyl isocyanate [[electronic resource] /] / Durga Nath Dhar, Preeti Dhar
| The chemistry of chlorosulfonyl isocyanate [[electronic resource] /] / Durga Nath Dhar, Preeti Dhar |
| Autore | Dhar Durga Nath |
| Pubbl/distr/stampa | River Edge, N.J., : World Scientific, c2002 |
| Descrizione fisica | 1 online resource (xvi, 377 p. ) : ill |
| Disciplina | 661.894 |
| Altri autori (Persone) | DharPreeti |
| Soggetto topico |
Isocyanates
Chemistry, Organic Chlorosulfonyl isocyanate |
| ISBN | 981-277-702-4 |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto | Reactions: Alkenes; Dienes; Trienes; Tetraenes; Pentaene; Alcohols; Ketenes; Acetals; Acids; Amides; Oxygen Heterocycles; Heterocycles; Applications: Herbicides; Plant Protection Agents; Pesticides; Insecticides; Anticancer; Analgesics; Neuroleptics; Eye Disorders; Antibiotics; Inhibitors; Antibiotics; Cephem; Liquid Crystals; Textile; and other topics. |
| Record Nr. | UNINA-9910807881703321 |
|
Dhar Durga Nath
|
||
| River Edge, N.J., : World Scientific, c2002 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
The chemistry of double-bonded functional groups : Supplement A, Part 2 / / edited by Saul Patai
| The chemistry of double-bonded functional groups : Supplement A, Part 2 / / edited by Saul Patai |
| Pubbl/distr/stampa | London, England : , : John Wiley & Sons, Inc., , 1977 |
| Descrizione fisica | 1 online resource (1343 pages) : illustrations |
| Disciplina | 2002 |
| Collana | Chemistry of functional groups |
| Soggetto topico |
Physical organic chemistry
Functional groups Chemistry, Organic |
| ISBN |
0-470-77842-3
0-470-77151-8 0-470-77181-X |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto | [pt. 1.] Dipole moments, configurations and conformations of molecules containing X=Y groups -- Otto Exner -- Liquid crystals with X=Y groups -- J.P. Van Meter -- Thermochemistry of X=Y groups -- Robert Shaw -- Mechanisms of elimination and addition reactions involving the X=Y group -- Anthony F. Cockerill and Roger G. Harrison -- The electrochemistry of X=Y groups -- Albert J. Fry and Roberta Gable Reed -- 1,3-Dipolar cycloadditions involving X=Y groups -- Giorgio Bianchi, Carlo De Micheli and Remo Gandolfi -- Reactions of carbenes with X=Y groups -- Alan P. Marchand -- [pt. 2.] The formation of unsaturated groups by heterolytic fragmentation -- Konrad B. Becker and Cyril A. Grob -- Electrophilic additions to carbon-carbon double bonds -- George H. Schmid and Dennis G. Garratt -- The olefin metathesis reaction -- Nissim Calderon -- Oxidation of C=C and C=N groups -- P.M. Henry and G.L. Lange -- Transition metal catalysed carbonylation of olefins -- John K. Stille and David E. James -- Imidines and diamidides (1,3,5-triazapentadienes) -- John A. Elvidge and N.R. Barot. |
| Altri titoli varianti | Double‐Bonded Functional Groups |
| Record Nr. | UNINA-9910830016903321 |
| London, England : , : John Wiley & Sons, Inc., , 1977 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
The Chemistry of Double-Bonded Functional Groups: Supplement A. Vol. 2
| The Chemistry of Double-Bonded Functional Groups: Supplement A. Vol. 2 |
| Autore | Patai Saul E |
| Pubbl/distr/stampa | [Place of publication not identified], : John Wiley & Sons Incorporated, 1989 |
| Descrizione fisica | 1 online resource : illustrations |
| Disciplina | 547 |
| Altri autori (Persone) | PataiSaul |
| Collana | Chemistry of functional groups. Supplement |
| Soggetto topico |
Physical organic chemistry
Functional groups Chemistry, Organic |
| ISBN |
0-470-77888-1
0-470-77225-5 0-470-77236-0 |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto | Vol. 2. 1989. [v. 2., pt. 1.] Complementary views on the homopolar double-bond structure -- Georges Trinquier and Jean-Paul Malrieu -- Mass spectrometry of the double bond -- Margaret N. Mruzek -- Nuclear magnetic resonance spectroscopy of C=C, C=O, C=N and N=N double bonds -- Poul Erik Hansen -- The photoelectron spectroscopy of double-bonded CC, CN, NN and CO groups -- L. Klasinc and S.P. McGlynn -- Directing and activating effects of doubly bonded groups -- Marvin Charton -- Double bonds from a biochemical perspective -- Alan H. Mehler -- Intramolecular 1,3-dipolar cycloadditions to double bonds -- O. Tsuge, T. Hatta and T. Hisano -- The ene reaction -- G.V. Boyd -- Radiation chemistry of double-bonded compounds -- Zeev B. Alfassi -- Asymmetric induction in additions to C=O and C=N bonds -- Joseph Klein -- Electrophilic additions to carbon-carbon double bonds --- George H. Schmid -- Mechanisms of base-catalyzed alkene-forming 1,2-eliminations -- Joseph R. Gandler -- [v. 2., pt. 2.] Carbonylation of main-group organometallic compounds -- Norma Nudelman -- Rearrangements involving allenes -- Samuel Braverman -- 1,1-Diarylalkenes -- William S. Murphy -- Fulvenes -- M. Neuenschwander -- The thiocarbonyl group -- Ernst Schaumann -- Cycloadditions of enones -- Janine Cossy, Pierre-Alain Carrupt and Pierre Vogel. |
| Record Nr. | UNINA-9910830559403321 |
|
Patai Saul E
|
||
| [Place of publication not identified], : John Wiley & Sons Incorporated, 1989 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
The Chemistry of Double-Bonded Functional Groups: Supplement A. Vol. 2
| The Chemistry of Double-Bonded Functional Groups: Supplement A. Vol. 2 |
| Autore | Patai Saul E |
| Pubbl/distr/stampa | [Place of publication not identified], : John Wiley & Sons Incorporated, 1989 |
| Descrizione fisica | 1 online resource : illustrations |
| Disciplina | 547 |
| Altri autori (Persone) | PataiSaul |
| Collana | Chemistry of functional groups. Supplement |
| Soggetto topico |
Physical organic chemistry
Functional groups Chemistry, Organic |
| ISBN |
0-470-77888-1
0-470-77225-5 0-470-77236-0 |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto | Vol. 2. 1989. [v. 2., pt. 1.] Complementary views on the homopolar double-bond structure -- Georges Trinquier and Jean-Paul Malrieu -- Mass spectrometry of the double bond -- Margaret N. Mruzek -- Nuclear magnetic resonance spectroscopy of C=C, C=O, C=N and N=N double bonds -- Poul Erik Hansen -- The photoelectron spectroscopy of double-bonded CC, CN, NN and CO groups -- L. Klasinc and S.P. McGlynn -- Directing and activating effects of doubly bonded groups -- Marvin Charton -- Double bonds from a biochemical perspective -- Alan H. Mehler -- Intramolecular 1,3-dipolar cycloadditions to double bonds -- O. Tsuge, T. Hatta and T. Hisano -- The ene reaction -- G.V. Boyd -- Radiation chemistry of double-bonded compounds -- Zeev B. Alfassi -- Asymmetric induction in additions to C=O and C=N bonds -- Joseph Klein -- Electrophilic additions to carbon-carbon double bonds --- George H. Schmid -- Mechanisms of base-catalyzed alkene-forming 1,2-eliminations -- Joseph R. Gandler -- [v. 2., pt. 2.] Carbonylation of main-group organometallic compounds -- Norma Nudelman -- Rearrangements involving allenes -- Samuel Braverman -- 1,1-Diarylalkenes -- William S. Murphy -- Fulvenes -- M. Neuenschwander -- The thiocarbonyl group -- Ernst Schaumann -- Cycloadditions of enones -- Janine Cossy, Pierre-Alain Carrupt and Pierre Vogel. |
| Record Nr. | UNINA-9910840991003321 |
|
Patai Saul E
|
||
| [Place of publication not identified], : John Wiley & Sons Incorporated, 1989 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
Chemistry of natural compounds
| Chemistry of natural compounds |
| Pubbl/distr/stampa | London, : Kluwer/Plenum Publishers |
| Disciplina | 547 |
| Soggetto topico |
Chemistry, Organic
Chimie organique |
| ISSN | 1573-8388 |
| Formato | Materiale a stampa |
| Livello bibliografico | Periodico |
| Lingua di pubblicazione | eng |
| Record Nr. | UNISA-996215985103316 |
| London, : Kluwer/Plenum Publishers | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. di Salerno | ||
| ||
Chemistry of natural compounds
| Chemistry of natural compounds |
| Pubbl/distr/stampa | London, : Kluwer/Plenum Publishers |
| Disciplina | 547 |
| Soggetto topico |
Chemistry, Organic
Chimie organique |
| ISSN | 1573-8388 |
| Formato | Materiale a stampa |
| Livello bibliografico | Periodico |
| Lingua di pubblicazione | eng |
| Record Nr. | UNINA-9910141123403321 |
| London, : Kluwer/Plenum Publishers | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
Chemistry of natural products : amino acids, peptides, proteins and enzymes / / V. K. Ahluwalia, Lalita S. Kumar, and Sanjiv Kumar
| Chemistry of natural products : amino acids, peptides, proteins and enzymes / / V. K. Ahluwalia, Lalita S. Kumar, and Sanjiv Kumar |
| Autore | Ahluwalia V. K. |
| Pubbl/distr/stampa | Cham, Switzerland : , : Springer, , [2022] |
| Descrizione fisica | 1 online resource (250 pages) |
| Disciplina | 631 |
| Soggetto topico |
Natural products
Chemistry, Organic |
| ISBN | 3-030-86698-X |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto |
Intro -- Preface -- Contents -- About the Authors -- 1 Amino Acids -- 1.1 Introduction -- 1.2 Nomenclature of Amino Acids -- 1.2.1 Representation of Amino Acids -- 1.3 Classification of Amino Acids -- 1.3.1 Coded or Primary Protein Amino Acids -- 1.3.2 Secondary and Tertiary Protein Amino Acids -- 1.3.3 Non-coded or Non-protein Amino Acids -- 1.3.4 Essential Amino Acids -- 1.4 Stereochemical Aspects of α-Amino Acids -- 1.4.1 Absolute Configuration of α-Amino Acids -- 1.4.2 Amino Acids with Two Chiral Centres -- 1.5 Physical Properties of α-Amino Acids -- 1.5.1 General Physical Properties -- 1.5.2 Acid-Base Properties of Amino Acids -- 1.5.3 Spectral Properties of α-Amino Acids -- 1.6 Chemical Reactions of Amino Acids -- 1.6.1 Reactions Due to Amino Group -- 1.6.2 Reactions Due to Carboxyl Group -- 1.6.3 Reactions Due to Both Amino and Carboxyl Groups -- 1.7 Industrial Preparation of α-Amino Acids -- 1.8 Chemical Synthesis of α-Amino Acids -- 1.8.1 Enantiomeric Resolution of α-Amino Acids -- 1.8.2 Asymmetric Synthesis of α-Amino Acids -- 1.9 Industrial Applications of α-Amino Acids -- 2 Peptides -- 2.1 Introduction -- 2.2 Structure and Classification of Peptides -- 2.2.1 Structure of Peptide Bond -- 2.2.2 Classification of Peptides -- 2.3 Nomenclature of Peptides -- 2.3.1 Representation of Peptides and Polypeptides -- 2.4 Peptide Synthesis -- 2.4.1 Protection of Amino Group -- 2.4.2 Protection of Carboxyl Group -- 2.4.3 Protection of Side Chains -- 2.4.4 Coupling Methods -- 2.5 Solid-Phase Peptide Synthesis -- 2.5.1 Solid-Phase Peptide Synthesis Using t-Boc Protection (Merrifield Approach) -- 2.5.2 Solid-Phase Peptide Synthesis Using Fmoc Protection (Sheppard's Approach) -- 2.5.3 Limitations of Solid-Phase Peptide Synthesis -- 2.6 Some Biologically Important Peptides -- 2.6.1 Oxytocin -- 2.6.2 Glutathione -- 2.6.3 Insulin -- 2.6.4 Bradykinin.
2.6.5 Gramicidin S -- 3 Proteins -- 3.1 Introduction -- 3.2 Classification of Proteins -- 3.2.1 Classification on the Basis of Shape and Structure -- 3.2.2 Classification on the Basis of Products of Hydrolysis -- 3.2.3 Classification on the Basis of Biological Functions -- 3.3 Properties of Proteins -- 3.3.1 Molecular Weight -- 3.3.2 Amphoteric Nature -- 3.3.3 Solubility -- 3.3.4 Precipitation -- 3.3.5 Denaturation -- 3.3.6 Colour Reactions -- 3.4 Structural Organisation of Proteins -- 3.4.1 Covalent or Primary Structure of Proteins -- 3.4.2 Conformational Aspects of Proteins: Higher Order Structures -- 4 Enzymes -- 4.1 Introduction -- 4.2 Nomenclature and Classification of Enzymes -- 4.2.1 Systematic and Recommended Names -- 4.2.2 Classification Numbers and Code Names -- 4.3 Characteristics of Enzymes -- 4.3.1 Catalytic Power -- 4.3.2 Enzyme Specificity -- 4.3.3 Enzyme Regulation -- 4.4 Mechanism of Enzyme Action -- 4.5 Factors Affecting Enzyme Action -- 4.6 Chymotrypsin: An Enzyme in Action -- 4.6.1 Structure of Chymotrypsin -- 4.6.2 Important Amino Acid Residues of Chymotrypsin -- 4.6.3 Mechanism of Action -- 4.7 Cofactors (or Coenzymes) -- 4.7.1 Nicotinamide Adenine Dinucleotide (NAD+) and Nicotinamide Adenine Dinucleotide Phosphate (NADP+) -- 4.7.2 UDP-Glucose -- 4.7.3 Flavin Mononucleotide (FMN) and Flavin Adenine Dinucleotide (FAD) -- 4.7.4 Thiamine Pyrophosphate (TPP) -- 4.7.5 Cocarboxylase -- 4.7.6 Pyridoxal-5-Phosphate -- 4.8 Enzymes in Organic Synthesis -- 4.8.1 Enzymatic Oxidations -- 4.8.2 Enzymatic Hydroxylation -- 4.8.3 Enzymatic Hydrolysis -- 4.8.4 Enzymatic Reductions -- 4.8.5 Enzymatic Isomerisations -- 4.8.6 Pharmaceutical Applications of Enzymes -- Suggested Readings -- Glossary -- Index. |
| Record Nr. | UNINA-9910633936903321 |
|
Ahluwalia V. K.
|
||
| Cham, Switzerland : , : Springer, , [2022] | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
Chemistry of organo-hybrids : synthesis and characterization of functional nano-objects / / edited by Bernadette Charleux, Laboratoire de Chimie, Catalyse, Polymeres et Procedes, Universite Claude Bernard, Lyon 1, Villeurbanne Cedex, France, Christophe Copéret, Department of Chemistry, ETH Zurich, Zurich, Switzerland, Emmanuel Lacóte, Laboratoire C2P2, CNRS--CPE Lyon--Universite de Lyon, Villeurbanne Cedex, France
| Chemistry of organo-hybrids : synthesis and characterization of functional nano-objects / / edited by Bernadette Charleux, Laboratoire de Chimie, Catalyse, Polymeres et Procedes, Universite Claude Bernard, Lyon 1, Villeurbanne Cedex, France, Christophe Copéret, Department of Chemistry, ETH Zurich, Zurich, Switzerland, Emmanuel Lacóte, Laboratoire C2P2, CNRS--CPE Lyon--Universite de Lyon, Villeurbanne Cedex, France |
| Pubbl/distr/stampa | Hoboken, New Jersey : , : John Wiley & Sons, Inc., , [2015] |
| Descrizione fisica | 1 online resource (548 p.) |
| Disciplina | 661/.0681 |
| Soggetto topico |
Chemistry, Organic
Physical organic chemistry Nanostructured materials |
| ISBN |
1-118-87006-9
1-118-87005-0 |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto |
Chemistry of Organo-Hybrids; Contents; Preface; Contributors; 1 Covalent Organic Functionalization and Characterization of Carbon Nanotubes; 1.1 Introduction; 1.2 Covalent Functionalization of Carbon Nanotubes with Organic Molecules; 1.2.1 Defect-Site Chemistry; 1.2.2 Halogenation; 1.2.3 Arylation; 1.2.4 Cycloaddition Reactions; 1.2.5 Radical Addition; 1.2.6 Nucleophilic and Electrophilic Additions; 1.2.7 Plasma Functionalization and Mechanochemical Treatment; 1.3 Characterization of Functionalized Carbon Nanotubes; 1.3.1 Spectroscopic Techniques; 1.3.2 Microscopic Techniques
1.3.3 Thermal Techniques1.4 Conclusion; References; 2 Functionalized Graphenes; 2.1 Starting Materials; 2.2 Characterization; 2.3 Functionalization; 2.3.1 Functionalization on the Carbon Framework; 2.3.2 Functionalization Involving an Oxygenated Function; 2.4 Conclusion; References; 3 Nanodiamonds: Emergence of Functionalized Diamondoids and Their Unique Applications; 3.1 Introduction; 3.2 Historical Background: From the Synthesis of Detonation Nanodiamond to the Isolation and Characterization of Higher Diamondoids; 3.2.1 Nanodiamond versus Diamondoids: The Case of Polymantanes 3.2.2 Synthesis of Polymantanes versus Extraction from the Geosphere3.2.3 Diamondoid Nomenclature and Characterization; 3.3 Functionalization of Adamantane, Diamantane, and Higher Diamondoids; 3.3.1 Diamondoid Halides; 3.3.2 Hydroxylated Diamondoids; 3.3.3 Metallated Nucleophilic Diamondoids; 3.3.4 Amino and Nitro Diamondoids and Their Derivatives; 3.3.5 Polyfunctionalized Diamondoids with Different Reactive Functionalities; 3.3.6 Alkyl-, Aryl-, Olefin-, Phosphine-, Cyano-, and Thiol-Substituted Diamondoids; 3.4 Organohybrids Built on Nanodiamond and Diamondoids and Their Applications 3.4.1 Biological Applications of Nanodiamond and Diamondoid-Based Hybrids3.4.2 Polymeric Diamondoid Materials; 3.4.3 Molecular Mechanics and Electronics Innovations from Diamond Nanoassembly; 3.4.4 Synthetic and Catalytic Applications Associated to Modified Diamondoids; Abbreviations; References; 4 Titania-Based Hybrid Materials: From Molecular Precursors To The Controlled Design of Hierarchical Hybrid Materials; 4.1 Introduction; 4.2 Overview of the Reactivity of Precursors and Consequences on Structures at Large scale of Titanium-Based OXO-Polymers 4.2.1 The Real Nature of the Precursor Ti(OR)44.2.2 Chemical Additives as Inhibitors of Condensation; 4.3 Main Chemical Routes for the Synthesis of Titania-Based Hybrid Materials; 4.3.1 Route A; 4.3.2 Route B; 4.3.3 Route C; 4.3.4 Route D; 4.4 Titania-Based Hybrid Mesostructured Materials; 4.4.1 Overview; 4.4.2 Evaporation-Induced Self-Assembly (EISA); 4.4.3 Hybrid O-I Titania-Based POMTFs; 4.5 Conclusion; References; 5 Functionalization of Zirconium Oxide Surfaces; 5.1 Introduction; 5.2 Why Zirconia-organic Hybrids?; 5.2.1 Mechanical Properties; 5.2.2 Chemical Properties 5.2.3 Optical and Electrical Properties |
| Record Nr. | UNINA-9910132285503321 |
| Hoboken, New Jersey : , : John Wiley & Sons, Inc., , [2015] | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
Soggetto topico
-
Chemistry, Organic
(671)
- Chemistry (98)
- Organic compounds - Synthesis (73)
- Organic reaction mechanisms (69)
- Chemical reactions (35)