ISSN:
0018-019X
Schlagwort(e):
Chemistry
;
Organic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
In the reaction between triphenyl phosphomethylene and benzaldehyde, the decomposition of the intermediate betaine is very slow compared with its rate of formation, and at 40° in chloroform, the dissociation of the betaine into the initial reactants can be followed. On the other hand, the first stage in the reaction between betaines of the type, Ph3PCHCOR, and benzaldehyde is the slow one. The rate of reaction is determined by the pKa of the corresponding phosphonium salt according to the BRÖNSTED catalysis law.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/hlca.19630460512
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