Process for preparing a methylene-bridged biscyclopentadienyl co

Details Process for preparing a methylene-bridged biscyclopentadienyl co Process for preparing a methylene-bridged biscyclopentadienyl co

1997-09-12

1999-08-31

Nazario-Gonzalez, Porfirio

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

Organic compounds

Heavy metal containing

556 1, 556 43, 556 58, 526160, 526943, 502103, 502117, 502152, 534 15, 585361, C07F 1700, C07F 728, C07F 1100

Patent

active

059455535

ABSTRACT:
Process for preparing a methylene-bridged cyclopentadienyl compound
The present invention relates to a process for preparing a methylene-bridged biscyclopentadienyl compound having the formula I ##STR1## Where L are, independently of one another, identical or different and are each a cyclopentadienyl group, by reactin one or two cyclopentadienyl compounds LH with formaldehyde in monomeric, oligomeric or polymeric form or formaldehyde-generating reagents in the presence of at least one base and at least one phase transfer catalyst.

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Ewen et al., Makromol. Chem., Macromol. Symp., vol. 48/49, pp. 253-295, 1991.
E. Ghera et al., "Reactions of Active Methylene Compounds in Pyridine Solution. II. Aldol-type Reactions of Indene and Flourene", Journal of The American Chemical Society, (1960), pp. 4945-4952.
N.E. Schore et al., "Carbon-Carbon Bond Formation in Dinuclear Dialkyl CH.sub.2 CF.sub.3) and (C.sub.11 H.sub.10)(CO.sub.2 (CO).sub.2 CH.sub.3).sub.2 with Carbon Monoxide and Triphenylphosphine", Journal of the American Chemical Society, (1984) pp. 7451-7461.

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