Alkaline earth metal organometallic compounds, their preparation

Details Alkaline earth metal organometallic compounds, their preparation Alkaline earth metal organometallic compounds, their preparation

1974-11-15

1976-06-29

McCarthy, Helen M.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252431N, 252431P, 260880B, 260335, 260665R, B01J 3112, C07D31182

Patent

active

039666387

ABSTRACT:
Organometallic compounds of high carbanion yield are prepared by metallation with barium, strontium or calcium or mixture of the same of certain acidic organic compounds having a pKa value of between about 15 and 35 on the MSAD scale in the presence of aprotic polar solvents, e.g., barium reacted with xanthene in 1,2-dimethoxyethane to yield dixanthenyl barium. Such organometallic compounds formed by metal-hydrogen exchange reaction are useful in initiating anionic growth-type polymerization of monomers, e.g., alkylene oxides and vinyl compounds, to form homopolymers and copolymers. The persistence of polymer carbanions created by such catalysts makes possible the controlled preparation of a variety of polymers, including block copolymers.

REFERENCES:
patent: 3270084 (1966-08-01), Schriesheim
patent: 3509067 (1970-04-01), Bostick
patent: 3928302 (1975-12-01), Hargis et al.

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