Reagent for organic synthesis reaction containing organic triol borate salt

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[PROBLEM] To rovide an organoboron com ound-containing reagent for organic synthesis reactions which undergoes no trimerization with dehydration, does not necessitate activation with a base, and is stable and highly active. [MEANS FOR SOLVING PROBLEMS] The reagent for organic synthesis reactions contains an organic triol borate salt re resented by any of the general formulae (I) to (m) and general formula (XVI) : (wherein R I represents alkyl, alkenyl, etc.; R 2 re resents optionally substituted alkyl, alkenyl, alkynyl, etc. or represents hydrogen; m÷ represents an alkaline metal ion, phosphonium ion, or given ammonium ion; M 2÷ represents an alkaline earth metal; X represents halogen or alkoxide; Y represents an alkali metal ion, etc.; A represents optionally substituted methylene; and n re resents an integer).