[(2S,5R)-1-Methyl-5-phenyl-pyrrolidin-2-yl]diphenyl-methanol

In the title compound, C(24)H(25)NO, the phenyl and diphenyl-methanol substituents are syn to each other. The pyrrolidine ring has an envelope conformation with the flap atom being the C atom bearing the phenyl substituent. The hy-droxy group forms an intra-molecular hydrogen bond with the pyrrolidine N atom, and the phenyl rings lie to same side of the mol-ecule. The crystal packing features C-H⋯π inter-actions. Two slightly displaced co-planar orientations were found for one of the phenyl rings; the major component had a site-occupancy factor of 0.782 (15).

Highly Stereoselective One-Pot Procedure To Prepare Bis- and Tris-chalcogenide Alkenes via Addition of Disulfides and Diselenides to Terminal Alkynes

We present here the reaction of diorganoyl dichalcogenides with terminal alkynes under catalyst-free conditions, by a one-pot procedure, to prepare bis- and tris-chalcogenide alkenes selectively, avoiding the previous preparation of chalcogen alkynes. The reaction proceeded cleanly under mild reaction conditions, and the addition of dichalcogenides to alkynes occurred stereoselectively to give exclusively the corresponding Z isomers. We observed that the selectivity control was governed by the effective participation of the hydroxyl group from propargyl alcohols. In addition, the bis-chalcogenide alkenes were exclusively obtained with propargyl alcohol having the acidic hydroxyl group proton. Conversely, the alkynes with no potentially acidic hydroxyl group proton, at propargyl positions, gave exclusively the tris-chalcogenide alkenes.

Hydrotelluration of aminoalkynes

Metal tellurolates (M = B3+; BuTeTeBu/NaBH4/EtOH; Li3+, Te0/BuLi/THF; In3+, BuTeTeBu/InI/EtOH) react with aminoalkynes to produce vinylic tellurides containing amino groups; the regio-, and stereo-chemistry of the hydrotelluration reaction depend on the metallic counter ion and on the nature of the amino group substituent.