Asymmetric synthesis of the methyl and benzyl ethers of erythro-.alpha.,.beta.-diphenyl-.beta.-hydroxyethanol and erythro-.alpha.,.beta.-diphenyl-.beta.-hydroxyethylamine from (+)-(S)-benzoin
Asymmetric synthesis of the methyl and benzyl ethers of erythro-.alpha.,.beta.-diphenyl-.beta.-hydroxyethanol and erythro-.alpha.,.beta.-diphenyl-.beta.-hydroxyethylamine from (+)-(S)-benzoin