New approach to sugar derivatives by Pummerer reactions of optically active suiphoxide and sulphide having a 7-oxabicyclo[2.2.1]heptane ring system

1991 ◽  
pp. 1667 ◽  
Author(s):  
Tamiko Takahashi ◽  
Hironori Kotsubo ◽  
Toru Koizumi
Keyword(s):  
Ring System ◽  
Optically Active ◽  
New Approach ◽  
Sugar Derivatives

New Approach to the Theory of Circular Dichroism

1998 ◽  
Vol 63 (8) ◽  
pp. 1187-1201 ◽  
Author(s):  
Jaroslav Zamastil ◽  
Lubomír Skála ◽  
Petr Pančoška ◽  
Oldřich Bílek
Keyword(s):  
Electromagnetic Wave ◽  
Circular Dichroism ◽  
Electromagnetic Waves ◽  
Maxwell Equations ◽  
Optically Active ◽  
Semiclassical Approach ◽  
New Approach ◽  
Isotropic Media ◽  
New Formula ◽  
Circular Dichroïsm

Using the semiclassical approach for the description of the propagation of the electromagnetic waves in optically active isotropic media we derive a new formula for the circular dichroism parameter. The theory is based on the idea of the time damped electromagnetic wave interacting with the molecules of the sample. In this theory, the Lambert-Beer law need not be taken as an empirical law, however, it follows naturally from the requirement that the electromagnetic wave obeys the Maxwell equations.

New Approach to the Steroid BCD-Ring System Using Tandem Radical Cyclization

1997 ◽  
Vol 62 (7) ◽  
pp. 1912-1913 ◽  
Author(s):  
Takashi Takahashi ◽  
Satoshi Tomida ◽  
Yasuharu Sakamoto ◽  
Haruo Yamada
Keyword(s):  
Ring System ◽  
Radical Cyclization ◽  
New Approach

Synthesis and Selected Transformation of Optically Active Cyclopentenyl Sulfoxides: New Approach to Optically Active Cyclopentenones.

ChemInform ◽  
2007 ◽  
Vol 38 (27) ◽  
Author(s):  
W. H. Midura ◽  
J. Krysiak ◽  
M. W. Wieczorek ◽  
A. Filipczak
Keyword(s):  
Optically Active ◽  
New Approach

A new approach to the stereoselective synthesis of trans-3-carbamoyl-β-lactam moieties

2017 ◽  
Vol 41 (6) ◽  
pp. 2479-2489 ◽  
Author(s):  
Anna Zakaszewska ◽  
Ewelina Najda-Mocarska ◽  
Sławomir Makowiec
Keyword(s):  
Stereoselective Synthesis ◽  
Optically Active ◽  
Thermal Generation ◽  
New Approach

Optically active 1,4-disubstituted-3-carbamoyl-azetidinones are synthesized from 5-[(N-arylamino)(hydroxyl)methylene]-2,2-dimethyl-1,3-dioxa-4,6-diones and chiral aldimines via thermal generation of carbamoyl ketenes and subsequent [2+2] cycloaddition.

ChemInform Abstract: A NEW APPROACH TO THE 1,4-BENZODIAZEPINE RING SYSTEM

1983 ◽  
Vol 14 (4) ◽  
Author(s):  
P. GIACCONI ◽  
E. ROSSI ◽  
R. STRADI ◽  
R. ECCEL
Keyword(s):  
Ring System ◽  
New Approach
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