CAS Registry Number

CAS 5717-37-3 — 1-Carbethoxyethylidene triphenylphosphorane

1-Carbethoxyethylidene triphenylphosphorane is a stabilized ylide widely used in organic synthesis, particularly for Wittig reactions to form alkenes from aldehydes or ketones. It is a key reagent in creating carbon-carbon double bonds with high stereoselectivity, making it essential in pharmaceutical and fine chemical manufacturing. This compound has a CAS number of 5717-37-3, with the molecular formula C23H21O2P and a molecular weight of 388.0494 g/mol. It requires storage at temperatures above +4°C and carries no signal word for hazard classification. Molekula supplies 1-Carbethoxyethylidene triphenylphosphorane from research to bulk quantities with full documentation and ISO 9001:2015 traceability.