ChemInform Abstract: ACYCLIC STEREOSELECTION. 12. DOUBLE STEREODIFFERENTIATION WITH MUTUAL KINETIC C RESOLUTION. A SUPERIOR CLASS OF REAGENTS FOR CONTROL OF CRAM′S RULE STEREOSELECTION IN SYNTHESIS OF ERYTHRO‐α‐ALKYL‐β‐HYDROXY CARBOXYLIC ACIDS FROM CHIRAL ALDEHYDES