Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Hideyuki Yamakoshi"'
Publikováno v:
Tetrahedron. 58:891-896
Ozonolyses of 1-alkyl-substituted 1- tert -butylethylenes and of highly methylated methylenecycloalkanes were conducted in the presence of trifluoroacetophenone ( 7 ) in ether. The ozonolysis of 2,2,6-trimethyl-1-methylenecyclohexane provided only th
Publikováno v:
The Journal of Organic Chemistry. 61:5953-5958
In order to understand the relative directing effects of the substituent steric and electronic effects on the cleavage of the primary ozonides, ozonolyses of a series of cyclohexene and cyclopentene derivatives were conducted in methanol or in ether
Publikováno v:
International Journal of Chemical Kinetics. 28:21-25
Publikováno v:
The Journal of Organic Chemistry. 61:5939-5943
In the ozonolyses of highly methylated 3,3,4,4,5,5-hexamethyl-1,2-bis(methylene)cyclopentane (1a) and 3,3,6,6-tetramethyl-1,2-bis(methylene)cyclohexane (1b), the epoxidation competed with the cleavage of the C−C double bond, whereas only the latter
Autor:
Janusz Baran, Masatomo Nojima, Hideyuki Yamakoshi, Elfriede Will, Koichi Teshima, Herbert Mayr
Publikováno v:
The Journal of Organic Chemistry. 59:5055-5058
Ozonolyses of 1,2,3,3,4,4,5,5-octamethyl- (1a), 1,2,3,3,4,4,5-heptanaethyl- (1b), and 1,2,3,3,4,4-hexamethyl cyclopentenes (1c) in methanol did not yield the ordinary hemiperacetals but gave the corresponding ozonides 6a-c instead. The ozonides 6a,b
Publikováno v:
The Journal of Organic Chemistry. 58:4212-4218
Ozonolyses of a series of vinyl ethers 1a-h having electron-withdrawing substituent(s) at the β-position were carried out in methanol and also in aprotic solvents in the presence of 1,3-dipolarophiles. Methanol-trapping experiments revealed that the
Autor:
In Chan Jung, Hideyuki Yamakoshi, M. Mori, Masatomo Nojima, Petra Krieger-Beck, Karl Griesbaum, Kevin J. McCullough, Shigekazu Kusabayashi
Publikováno v:
J. Chem. Soc., Perkin Trans. 1. :1335-1343
Reactions between cyclopenta-1, 3-dienes 1a–i and ozone, conducted in a variety of solvents including diethyl ether, pentane, CCl4, CH2Cl2, CF3CH2OH, AcOH, and MeOH, afforded predominantly monomeric ozonolysis products consisting of either bicyclic
Publikováno v:
ChemInform. 28
In the ozonolyses of highly methylated 3,3,4,4,5,5-hexamethyl-1,2-bis(methylene)cyclopentane (1a) and 3,3,6,6-tetramethyl-1,2-bis(methylene)cyclohexane (1b), the epoxidation competed with the cleavage of the C−C double bond, whereas only the latter
Autor:
I.‐C. Jung, Petra Krieger-Beck, Karl Griesbaum, Shigekazu Kusabayashi, Masatomo Nojima, M. Mori, Kevin J. McCullough, Hideyuki Yamakoshi
Publikováno v:
ChemInform. 24
Autor:
Toshihiko Tabuchi, Hideyuki Yamakoshi, M. Mori, Masatomo Nojima, Kevin J. McCullough, Shigekazu Kusabayashi
Publikováno v:
ChemInform. 26
Carbonyl oxides, derived from the ozonolysis of vinyl ethers, readily undergo [3 + 2] cycloadditions with imines, affording the corresponding 1,2,4-dioxazolidines 6a–z in the isolated yields of 14–97%. High degrees of stereoselectivity are observ