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Asym. substituted biaryldiphosphine ligands I (R1 = C1-6-alkyl or C3-10-cycloalkyl optionally substituted with one or more halogen atoms; R2 and R3 are equal and are C5-10-cycloalkyl or C1-6-alkyl, or R2 is C5-10-cycloalkyl or C1-6-alkyl, and R3 is aryl op ...
The introduction of a halogen atom at any arom. position of toluene considerably accelerates the base-promoted deprotonation of the Me group. P-Fluorotoluene is the only exception; proton abstraction from its benzylic site occurs approx. at one tenth of th ...
Provided is a process for prepn. of asym. substituted biaryldiphosphine ligands I (R1 = C1-6-alkyl, C3-10-cycloalkyl optionally substituted with one or more halogen atoms; R2, R3 = aryl, C5-10-cycloalkyl, C1-6-alkyl, or R2 = C5-10-cycloalkyl, C1-6-alkyl; R ...
The use of organometallic reagents for functionalization of arenes and heterocycles has recently been renewed by our group. The use of bulky trialkylsilyl groups allows one to shield an acidic position by steric hindrance and the introduction of a chlorine ...
Intube flow boiling experiments for refrigerant R-134a mixed with a lubricating oil are reported for a plain, horizontal tube. The tests were run at a nominal inlet pressure of 3.4 bar over a wide range of vapor qualities at mass velocities of 100, 200, an ...
The present invention concerns an intermediate of the following formula (I) in which R1 and R2 represent independently of each other a C1-C12 alkyl group, a (C1-C12 alkoxy)carbonyl group, optionally substituted by one, two or three halogen atom, a (C2-C12 ...
An improved two-phase flow pattern map is proposed for evaporation in horizontal tubes. Based on new flow pattern data for three different refrigerants covering a wide range of mass velocities, vapor qualities and heat fluxes. The new flow pattern map incl ...
The heterogeneous reactions of NO3 on NaCl and KBr salt were studied at room temp. using a Knudsen reactor equipped with dual detection, namely Laser induced fluorescence and mass spectrometry. The uptake coeffs. of NO3 were g=(4.9+-3).10-2 onto NaCl and g ...
When treated with tert-butyllithium in THF at -50 Deg, N-BOC (tert-butoxycarbonyl) protected fluoroanilines and trifluoromethylanilines, e.g., o-, m-, or p-F3CC6H4NHCO2CMe3, undergo metalation at the position adjacent to that carrying the nitrogen. If, how ...
The present invention concerns an intermediate of the following formula I in which R 1 and R 2 represent independently of each other a C 1 -C 12 alkyl group, a (C 1 -C 12 alkoxy)carbonyl group, optionally substituted by one, two or three halogen atom, a (C ...
