Process for the preparation of camphene by the rearrangement of

Details Process for the preparation of camphene by the rearrangement of Process for the preparation of camphene by the rearrangement of

1996-11-25

1998-10-20

Yildirim, Bekir

Chemistry of hydrocarbon compounds

Alicyclic compound synthesis

By shift, opening, or removal of shared-carbon ring

585355, C07C 522

Patent

active

058262024

ABSTRACT:
Process for the preparation of camphene by the rearrangement of .alpha.-pinene
A process for the preparation of camphene by the rearrangement of .alpha.-pinene in the presence of a titanium oxide hydrate catalyst under the action of heat, wherein .alpha.-pinene is refluxed until the content of .alpha.-pinene in the reaction mixture is still at least 3% by weight, and the rearrangement is then brought to completion in a secondary reaction at a temperature below 160.degree. C.
By carrying out the process in this way--refluxing to a relatively high residual content of .alpha.-pinene and performing a secondary reaction at a lower temperature--the formation of polymeric by-products is reduced. This process moreover increases the yield of camphene in that recycled tricyclene, concentrated in the distillation of the crude product, is partially rearranged to camphene or the formation of more tricyclene is reduced.

REFERENCES:
patent: 2551795 (1951-05-01), Etzel
Ullmans Encyclopadie der technischen Chemie, 3rd ed., vol. 17, Verlag Chemie, Weinheim, 1966, pp. 430-431.
Mai Lien, N., et al. Chem. Abs. 89: 197725g (1978).

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