Alpha-cleavage: Difference between revisions
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Fission of a bond originating at an atom which is adjacent to the one assumed to bear the charge; the definition of β - cleavage etc follows automatically. | Fission of a bond originating at an atom which is adjacent to the one assumed to bear the charge; the definition of β - cleavage etc follows automatically. | ||
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==Gold Book entry== | |||
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(in mass spectrometry) The fission of a bond originating at an atom which is adjacent to one assumed to bear the charge; the definition of ?-, ?-, cleavage then follows automatically. The process: | |||
would thus be described as ?-fission of a ketone with expulsion of a radical R1. . The carbon atoms of the radical R1. are called the ?-, ?-, ?-carbons, starting with the atom nearest the functional group. | |||
'''Source''': | |||
PAC, 1991, 63, 1541 ([[Recommendations for nomenclature and symbolism for mass spectroscopy]] (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1558 | |||
(in photochemistry) Homolytic cleavage of a bond connecting an atom or group to an excited chromophore. Often applied to a bond connected to a carbonyl group, in which case it is called a Norrish type I photoreaction. | |||
'''Note''': | |||
This reaction should be distinguished from an alpha-(?-)elimination. | |||
'''Source''': | |||
PAC, 2007, 79, 293 ([[Glossary of terms used in photochemistry]], 3rd edition (IUPAC Recommendations 2006)) on page 302 | |||
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Revision as of 23:52, 17 July 2009
Obsolete Template
Orange Book entry
Orange Book
| ORANGE BOOK DEFINITION
IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979 (see also Orange Book 2023) |
| Alpha-cleavage |
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Fission of a bond originating at an atom which is adjacent to the one assumed to bear the charge; the definition of β - cleavage etc follows automatically. |
| IUPAC 1997 Orange Book Chapter 12 |
| Index of Orange Book Terms |
Gold Book entry
Gold Book
| GOLD BOOK DEFINITION
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the Gold Book). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997). |
| Alpha-cleavage |
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would thus be described as ?-fission of a ketone with expulsion of a radical R1. . The carbon atoms of the radical R1. are called the ?-, ?-, ?-carbons, starting with the atom nearest the functional group. Source: PAC, 1991, 63, 1541 (Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1558 (in photochemistry) Homolytic cleavage of a bond connecting an atom or group to an excited chromophore. Often applied to a bond connected to a carbonyl group, in which case it is called a Norrish type I photoreaction. Note: This reaction should be distinguished from an alpha-(?-)elimination. Source: PAC, 2007, 79, 293 (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 302 |
| IUPAC Gold Book |
| Index of Gold Book Terms |
