Stereoselective Intermolecular [2+2] photocycloaddition reactions of tetrahydrophthalic anhydride and derivatives with alkenols and alkynols
作者:Kevin I. Booker-Milburn、Justin K. Cowell、F. Delgado Jiménez、Andrew Sharpe、Andrew J. White
DOI:10.1016/s0040-4020(99)00250-1
日期:1999.4
Intermolecular [2+2] photocycloaddition of a variety of alken- and alkyn-3-ols with 3,4,5,6-tetrahydrophthalic anhydride (THPA) and the related imide (THPI) gave the corresponding cyclobutanes and cyclobutenes in high yield. Irradiation times were relatively short and stereoselectivities as high as for the cyclobutane examples.
Here we report a microfluidic system for photochemicalcycloadditions fabricated using silicon micro processing technologies. The system was optimized to yield residence times of just a few minutes for a range of photochemical [2+2]-cycloaddition reactions facilitated using high power UV-LEDs at 375 nm and triplet photosensitizers, which removed the need for the low wavelengths typically required for
Tetrahydrophthalic anhydride and imide: remarkably efficient partners in photochemical [2 + 2] cycloaddition reactions with alkenols and alkynols
作者:Kevin I. Booker-Milburn、Justin K. Cowell、Andrew Sharpe、F. Delgado Jiménez
DOI:10.1039/cc9960000249
日期:——
Intermolecular photochemical [2 + 2] cycloaddition of a variety of alken- and alkyn-3-ols with 3,4,5,6-tetrahydrophthalic anhydride (THPA) and the related imide 4 gave the corresponding cyclobutanes and cyclobutenes in high yield, after relatively short irradiation times, with stereoselectivities as high as 10:1 for the cyclobutane examples.
A Small-Footprint, High-Capacity Flow Reactor for UV Photochemical Synthesis on the Kilogram Scale
作者:Luke D. Elliott、Malcolm Berry、Bashir Harji、David Klauber、John Leonard、Kevin I. Booker-Milburn
DOI:10.1021/acs.oprd.6b00277
日期:2016.10.21
The development of a highly compact and powerful reactor for synthetic organic photochemistry is described enabling a 10-fold reduction in reaction times, with up to 30% more power efficiency than previous fluorinated ethylene propylene tube reactors. Two reactions gave over 1 kg of product in 24 h. Two other reactions had productivities of 4 and 8 kg in 24 h. The reactor consists of a succession of quartz tubes connected together in series and arranged axially around a variable power mercury lamp. This compact and relatively simple device can be safely operated in a standard fumehood.