3-Phenyl-1-propyn-3-ol was derived to its 3-nitrophthalate and submitted to optical resolution, affording A-ester of m.p. 152-153° (decomp.), [α]
D25-56.8°, and B-ester of m.p. 152-153° (decomp.), [α]
D25+55.7° Each was oxidized with potassium permanganate to mandelic acid nitrophthalate, affording A-acid of m.p. 178°, [α]
D28+87.6°, and B-acid of m.p. 178°, [α]
D28-90.7°. On the other hand,
dl-mandelic acid was resolved into L(+)- and D(-)-mandelic acid by the use of D- and L-
threo-3-(
p-nitrophenyl)-2-aminopropane-1, 3-diol, both were derived to respective 3-nitrophthalates, and absolute configuration was determined as L-system for A-acid and A-ester, and D-system for B-acid and B-ester. A- and B-esters were each hydrolysed and derived to the corresponding A-alcohol of b. p
18 118-119°, [α]
D27-23.9°, and B-alcohol of b. p
18 118-119°, [α]
D28+22.6°, Each was submitted to oxidative coupling with cuprous chloride and corresponding 1, 6-diphenylhexa-2, 4-diyne-1, 6-diol were obtained; L-type, m.p. 120° (decomp.), [α]
D26-27.6°, and D-type, m.p. 120°, [α]
D26+26.7°. An equimolar mixture of these L- and D-forms gave the racemic compound which was identical with 1, 6-diphenylhexa-2, 4-diyne-1, 6-diol, m.p. 134°, described in the preceding paper of this series. Consequently, this was found to be the racemic compound and the compound melting at 113° to be a
meso compound. Each was reduced to form 1, 6-diphenyl-hexane-1, 6-diol and the one of m.p. 134° was determined as the racemic compound and the other of m.p. 127° as the
meso compound.
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