PROCESS FOR MAKING NOVEL POLYCONDENSATION PRE-POLYESTERS, OTHER COPOLYESTER PRECURSORS, AND COPOLYESTERS

    公开(公告)号:US20220363816A1

    公开(公告)日:2022-11-17

    申请号:US17596690

    申请日:2020-06-26

    Abstract: This invention relates to a process for making a polycondensation pre-polyester, a polyester or both, comprising the following steps: A. Acylation of at least one diacid chloride with at least one alcohol to form at least one diester; B. Partial hydrolysis of the diester product of Step A to form at least one monoacid; C. Esterifying the monoacid of Step B with at least one diol to form a diester; D. Reacting the diester of Step C under acidic conditions to form a diacid; and subsequently, performing either Step E or Step F as follows: E. Bisalkylation of the diacid of Step D with at least one haloalcohol to form a pentamer, or F. Esterifiying the diacid of Step D under esterification conditions with at least one diol to form a pentamer, provided that the diol is not the same as the diol used in Step C.

    PROCESS FOR PREPARING BICYCLO[2.2.2]OCTANE-1,4-DIOL

    公开(公告)号:US20250109152A1

    公开(公告)日:2025-04-03

    申请号:US18980032

    申请日:2024-12-13

    Abstract: Provided is a process for preparing bicyclo[2.2.2]octane-1,4-diol starting from cyclohexane-1,4-dione. The dione is reacted with certain trialkylsilyl halides or trimethylsilyl trifluormethanesulfonate in the presence of a non-nucleophilic base to afford a silyl-substituted diene, which is in turn reacted with ethylene and subsequently reduced to provide the title compound.

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