"The conversion of carbohydrate derivatives into functionalized cyclohexanes and cyclopentanes". Chem. Rev. 93 (8): 2779-2831. ...
Building from this, several electrocyclic ring openings of β-alkoxy cyclopentanes have been reported. These are typically ...
Acetal 1 has been used in this context, and provides cyclopentanes with the acetal functionality exo to the newly formed ring ...
Silicate esters Ionic fluids Multiply alkylated cyclopentanes (MAC) PTFE: polytetrafluoroethylene (PTFE) is typically used as a ...
The Wolff rearrangement is capable of contracting cyclohexanones to cyclopentanes, but is infrequently used to do so, because ...
7-Dehydrocholesterol is the precursor of cholecalciferol.[2] Within the epidermal layer of skin, 7-dehydrocholesterol undergoes an electrocyclic reaction as a result of UVB light at wavelengths between 290 and 315 nm, with peak synthesis occurring between 295 and 300 nm.[34] This results in the opening of the vitamin precursor B-ring through a conrotatory pathway making previtamin D3 (pre-cholecalciferol).[35] In a process which is independent of UV light, the pre-cholecalciferol then undergoes a [1,7] antarafacial sigmatropic rearrangement [36] and therein finally isomerizes to form vitamin D3. The active UVB wavelengths are present in sunlight, and sufficient amounts of cholecalciferol can be produced with moderate exposure of the skin, depending on the strength of the sun.[34] Time of day, season, and altitude affect the strength of the sun, and pollution, cloud cover or glass all reduce the amount of UVB exposure. Exposure of face, arms and legs, averaging 5-30 minutes twice per week, may be ...
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