- Rotation in biphenyls with a single ortho-substituent
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Barriers to rotation in a range up to 15.4 kcal mol-1 were determined by dynamic NMR spectroscopy for a series of biphenyl compounds 1a-1h and 2a-2d with a single ortho-substituent. Ab initio calculations reproduce these barriers satisfactorily
- Mazzanti, Andrea,Lunazzi, Lodovico,Minzoni, Mirko,Anderson, J. Edgar
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p. 5474 - 5481
(2007/10/03)
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- The structure and synthesis of tsitsikammafuran: A new furanosesquiterpene from a south african Dysidea sponge
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Three furanosesquiterpenes, the new tsitsikammafuran (1) and the known nakafurans-8 (2) and -9 (3) were isolated from a South African Dysidea sponge. The structure of tsitsikammafuran, initially proposed as 3-[(furan-3-yl)methyl]-p-cymene, from a combination of biosynthetic arguments and the available spectroscopic data, was unequivocally confirmed by the synthesis of 1 from thymol. The synthesis of two regioisomers of tsitsikammafuran, 4-[(furan-3-yl)methyl]-m-cymene (4) and 2-[(furan-3-yl)methyl]-p-cymene (22), from p-cresol and 2-bromo-2-nitrocamphane respectively, further supported the structural assignment of 1. (C) 2000 Elsevier Science Ltd.
- McPhail, Kerry L.,Rivett, Douglas E.A.,Lack, David E.,Davies-Coleman, Michael T.
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p. 9391 - 9396
(2007/10/03)
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- A simple and improved procedure for selective ring bromination of alkyl-substituted aromatic hydrocarbons on the surface of alumina
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Highly selective ring bromination of alkyl-substituted aromatic hydrocarbons has been achieved using molecular bromine adsorbed on the surface of alumina without any solvent.
- Ranu,Sarkar,Chakraborty
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p. 1095 - 1099
(2007/10/02)
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