Preferred Label : hula-twist (HT) mechanism;
IUPAC acronym : OBF; HT;
IUPAC definition : Volume-conserving mechanism of photoisomerization of a double bond in a conjugated
system involving simultaneous configurational and conformational isomerization, e.g.,
the photoinitiated concerted rotation of two adjacent double and single bonds.;
Scope note : under unconstrained conditions, the conventional one-bond-flip (obf) process is the
dominant process with the hula-twist (ht) being an undetectable higher energy process.
it has been proposed that under confined conditions (e.g., a conjugated double bond
chromophore in a protein cavity or in a solid matrix), the additional viscosity-dependent
barriers makes the obf a less favourable process, allowing the volume-conserving ht
to be the dominant process for photoisomerization.;
Origin ID : HT07393;
Automatic exact mappings (from CISMeF team)
- See also
Volume-conserving mechanism of photoisomerization of a double bond in a conjugated
system involving simultaneous configurational and conformational isomerization, e.g.,
the photoinitiated concerted rotation of two adjacent double and single bonds.
