Preparation of 6,6'-dihydroxy-3,3,3',3'-tetramethyl-1,1'-spirobi

Details Preparation of 6,6'-dihydroxy-3,3,3',3'-tetramethyl-1,1'-spirobi Preparation of 6,6'-dihydroxy-3,3,3',3'-tetramethyl-1,1'-spirobi

1994-04-11

1995-03-21

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C07C 3912

Patent

active

053997832

ABSTRACT:
Crystals of 6,6'-dihydroxy-3,3,3',3'-tetramethyl -1,1'-spirobiindane (hereinafter referred to as SPI) are obtained by cooling a phenol solution containing 6,6'-dihydroxy-3,3,3',3'-tetramethyl-1,1'-spirobiindane when crystallization is started at a temperature higher than a transition temperature between SPI and an adduct of SPI with phenol. The crystals are washed with an organic solvent or contacted with water and further washed with an organic solvent. When crystallization is started at a temperature less than the transition temperature, adduct crystals of SPI with phenol are obtained from the phenol solution. Phenol is removed from the adduct crystals and the adduct crystals are contacted with water to obtain a hydrate and further the hydrate is washed with an organic solvent.

REFERENCES:
patent: 3271463 (1966-09-01), Howard
patent: 4605789 (1986-09-01), Silvis et al.
Journal of Polymer Science, Part A, vol. 3, pp. 3209-3217 (1965).
Journal of Chemical Society, 1962, p. 415.

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