✍ Scribed by Mary A. Schexnayder; Paul S. Engel
No coin nor oath required. For personal study only.
The diversity of photochemical reactions exhibited by 0,y-unsaturated ketones' (g,y-UK's) has prompted us to examine the triplet state properties of soms representative compounds.
The follow ing conclusions have emerged from this study 1) 2-norbornenone (lJ undergoes an unusual triplet sensitized 1,3-acyl shift.
Quantum yields for ketone disappearance and for product appearance in the triplet sensitized irradiation of compounds 1-3 are shown in Table I. __ Contrary to the usual behavior of 6,y-UK's,l triplet _l_ gives a considerable amount of the 1.3~acyl shift product 4' in addition to the repor-ted4 oxadivnlllethane product 2. Although one is tempted to attribute this result to singlet sen-
📜 SIMILAR VOLUMES
The photochemistry of b,g-unsaturated ketones has been a topic of great interest to organic photochemists for many years. [1] The results of studies in this area show that these substances undergo a 1,3-acyl migration on direct irradiation and an oxa-di-p-methane (ODPM) rearrangement in the presence
The photochemistry of b,g-unsaturated ketones has been a topic of great interest to organic photochemists for many years. [1] The results of studies in this area show that these substances undergo a 1,3-acyl migration on direct irradiation and an oxa-di-p-methane (ODPM) rearrangement in the presence
## Abstract For Abstract see ChemInform Abstract in Full Text.
We recently reported the singlet-state photochemical rearrangement of 3-methylene-2,2,5,5-tetramet~lcyclohexanone (1) via a 1,3-sigmatropic acyl shift to 3,3-dimethyl-5-isopropylidenecyclohexanone (g).", However, 17~-acetoyy-4,4-dimetQrl-19-norandrost-5-en-3-one (3)isknown to undergo a triplet-state