Three C2-symmetric (10R,11R)-diethyl substituted dibenzosuberane (DBS)-based helicenes with varying steric and conjugation demands of their bottom fragments wer
The study on transition states is one of the most important pathways to understand the essence of chemical reactions. With the development of femtoseeond pulse
Introduction Owing to their potentially physical, mechanical and chemical properties nanocrystalline solid materials have recently received considerable attenti
Introduction There has been a very significarnt resurgence of interest in ab initio valence bond calculations recently. This is because the VB calculation based