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Role of the conformation in the reactivity of 1,3-diphosphapropenes

✍ Scribed by Maryse Gouygou; Max Koenig; Jean Escudié; Claude Couret

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
510 KB
Volume
2
Category
Article
ISSN
1042-7163

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✦ Synopsis

The symmetrical and unsymmetrical I ,3-diphosphapropenes 3 and 4 were obtained from the cowesponding diphosphiranes 1 and 2. The chemical behavior of these compounds has been studied. Phosphoniumphosphaalkenes 7a and 10a have been obtained in the reactions with aluminium trichloride. Whereas the symmetrical diphosphaallene 13 can be obtained by reaction of 1 or 3 with lithio compounds, the unsymmetrical diphosphaallene 14 cannot be prepared by a similar route. Reduction of 3a and 4a (obtained with a different conformation) by lithium aluminum hydride afforded phosphino-phosphaalkenes 17a and 18a (with a similar conformation); further dehydrochlorination with amines led to the symmetrical and unsymmetrical diphosphaallenes 13 and 14, respectively. The formation of allenes strongly depends on the conformation of the starting diphosphapropenes.

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