application may be in medicine where it might be possible to form three dimensional images of biological structures assuming that the problems associated with the transmission of sound in tissue can be solved. The fact that systems for use in acoustical holography are rapidly becoming all-electroni
Living cationic ring-opening polymerization of 3,4-dihydro-2H-benzo[4,5]imidazo[2,1-b]oxazine
β Scribed by Masatoshi Miyamoto; Kohei Tomari; Yoshiharu Kimura
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 100 KB
- Volume
- 200
- Category
- Article
- ISSN
- 1022-1352
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π SIMILAR VOLUMES
and 3-aminopyrazole and 3-amino-1,2,4-triazole provide convenient access to biologically relevant 3H-imidazo[1,2-b]pyrazoles and a 5H-imidazo[2,1-c][1,2,4]triazole.
UV irradiation of the title compounds 1 a Β± d results not in extrusion of molecular nitrogen, but in a skeletal rearrangement generating amino(imidoyl)phosphanes 2 a Β± c from 1 a Β± c and 2-hydrazinobenzo[b]phosphole 4 from 1 d. The first step in these isomerizations is an unprecedented (5 34) ring c
Highly enantioselective asymmetric hydrogenation of readily accessible olefins, (E)- and (Z)-[1-(toluene-4-sulfonyl)-1,2,3, 4-tetrahydro-1H-benzo[b]azepin-5-ylidene]acetic acid (4a and 4b, respectively) and [1-(toluene-4-sulfonyl)-2, 3-dihydro-1H-benzo[b]azepin-5-yl]acetic acid (4c), is presented as