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52. Vibrational Analysis of Some Substituted Methylbenzenes Part II. Transferability of Force Constants-The Case of Tetra-, Tri-methylbenzenes and Nitro-para-toluidine.

Author

Reddy, B. Venkatram, Ojha, Jai Kishan, and Rao, G. Ramana

Subjects
*TOLUIDINE, *TOLUENE, *VIBRATIONAL spectra, *ENERGY transfer, *FORCE & energy
Abstract

A zero-order normal coordinate analysis was made for 1,2,3,4-, 1,2,3,5-, 1,2,4,5-tetramethylbenzene, 1,2,3-trimethylbenzene and 2-nitro-para-toluidine by transferring the force constants from our earlier work. The observed and calculated frequencies agree with an average error of 16.4 cm-1. On the basis of the results obtained Unambiguous vibrational assignments of fundamentals of the five molecules have been made using the potential energy distributions and eigen vectors and several assignments suggested by earlier workers have been revised. [ABSTRACT FROM AUTHOR]

Published
2011
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56. Asymmetric Approach to Hyacinthacines B1 and B2.

Author

Reddy, Paidi Venkatram, Smith, Julien, Kamath, Anushree, Jamet, Hélène, Veyron, Amaël, Koos, Peter, Philouze, Christian, Greene, Andrew E., and Delair, Philippe

Subjects
*ALKALOID synthesis, *CHEMICAL synthesis, *INTERMEDIATES (Chemistry), *STEREOSELECTIVE reactions, *ETHERS, *RING formation (Chemistry), *ALKYLATION
Abstract

Naturally occurring hyacinthacines B1 and B2 have been prepared from a common, easily available, advanced intermediate. The approach features several highly stereoselective transformations: inter alia, a dichloroketene-enol ether [2 + 2] cycloaddition, a Bruylants alkylation, and an amino-nitrile alkylation-reduction. [ABSTRACT FROM AUTHOR]

Published
2013
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60. Nonchiral-Pool Synthesis of (+)-Hyacinthacine B1.

Author

Reddy, Paidi Venkatram, Koos, Peter, Veyron, Ama�l, Greene, Andrew E., and Delair, Philippe

Subjects
*RING formation (Chemistry), *KETENES synthesis, *ALKYLATION, *ETHERS, *CHEMICAL synthesis
Abstract

The first nonchiral-pool total synthesis of (+)-hyacinthacine B1 has been achieved. The synthesis uses as key steps an efficient [2+2] cycloaddition of dichloroketene to a chiral enol ether, two diastereoselective Bruylants-like alkylations, and an effective double Tamao-Fleming oxidation. [ABSTRACT FROM AUTHOR]

Published
2009
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