One of the most intriguing dissymmetric shapes is the helix. It was developed in natural
systems in the early stages of evolution and used as the structural motif for the molecules of …

Revised Manuscript Received September 16, 1995 Helical polymers1 (eg, DNA or helical
polypeptides) are well known for their importance in nature. In proteins, helical rigidity acts to …

Polyisocyanates (nylon 1) offer a lot of fascinating properties due to their dynamic helical
conformation, which gives rise to orientational phenomena (large persistence length) or …

Stable helical polymers with a preferred handedness are compounds that offer intriguing
characteristics. This review describes the progress in the synthesis of helical …

Empirical force field studies of poly (alkyl isocyanates) are presented. A barrier of 12.5
kcal/mol for cis-trans isomerization of the polymer-backbone's conjugated partial double …

Here we describe the synthesis of seven new copolymer series prepared by
copolymerization of hexyl isocyanate with seven new chiral azo chromophores with an …

An optically inactive poly (4-carboxyphenyl isocyanide)(poly-1-H) changed its structure into
the prevailing, one-handed helical structure upon complexation with optically active amines …

Isocyanides polymerize under the catalytic activity of Ni (II) to the corresponding poly
(isocyanides): nRN+= C “2ÜÍÜL [RN= C<]„. The polymers are of the rigid-rod type, and their …

In polyisocyanates composed only of randomly distributed (R) and (S) units, the chiral
optical properties of the polymer are far out of proportion to the enantiomeric excess of the …

The qualitative model of a chirally perturbedpolyisocyanate chain, with long helical
sequences separated by helical sense reversals, has been interpreted quantitatively by …