38696-14-9Relevant academic research and scientific papers
Cobalt-Catalyzed Suzuki Biaryl Coupling of Aryl Halides
Asghar, Soneela,Tailor, Sanita B.,Elorriaga, David,Bedford, Robin B.
, p. 16367 - 16370 (2017/12/07)
Readily accessed cobalt pre-catalysts with N-heterocyclic carbene ligands catalyze the Suzuki cross-coupling of aryl chlorides and bromides with alkyllithium-activated arylboronic pinacolate esters. Preliminary mechanistic studies indicate that the cobalt
Aspects of crystal engineering arising from packing behavior of functional mono para-substituted trityl compounds
Knepper, Ingo,Seichter, Wilhelm,Skobridis, Konstantinos,Theodorou, Vassiliki,Weber, Edwin
, p. 6355 - 6369 (2015/08/24)
Four trityl compounds differing both in the functional group (OH, OMe, NH2) at the specific trityl carbon and a para substituent, being bromine or phenyl at one of the phenyl groups, have been prepared and structurally studied by means of singl
p-Methoxy Diphenylmethanol (MDPM), p-Phenyl Diphenylmethanol (PDPM), and p-Phenylphenyl Diphenylmethanol (PPDPM) - Protecting Groups for Alcohols - Protection and Deprotection
Sharma,Prasad, T. Rajendra,Srinivas, Rakesh B.
, p. 941 - 950 (2007/10/03)
Two new protecting groups viz. p-phenyl diphenylmethanol (PDPM) and p-phenylphenyl diphenylmethanol (PPDPM) were prepared and utilized along with p-methoxy diphenylmethanol (MDPM), for the protection of alcohols in the presence of Yb(OTf)3. Deprotection of the above ethers was achieved using DDQ or CF3COOH.
Superacid-catalyzed reaction of substituted benzaldehydes with benzene
Saito, Shinichi,Ohwada, Tomohiko,Shudo, Koichi
, p. 8089 - 8093 (2007/10/03)
Benzaldehydes bearing an electron-withdrawing group reacted with 2 equiv of benzene in the presence of a superacid, trifluoromethanesulfonic acid, to give substituted triphenylmethane in good yields. On the other hand, benzaldehydes bearing an electron-donating or a neutral group reacted under the similar conditions to give unsubstituted diphenylmethane and triphenylmethanol, together with substituted benzene. We propose a new mechanism of this reaction, which involves transalkylation as the key step.
Hydrogen Bonding in Diphenylmethanols, RCPh2OH: Structures of Monomeric (4-Biphenyl)diphenylmethanol and Diphenyl(2-pyridyl)methanol, Dimeric 1,1,3-Triphenylpropyn-1-ol, Trimeric 2-Methyl-1,1-diphenylpropan-1-ol, Tetrameric Diphenyl(2-thienyl)methanol, Hexameric Bis(pentafluorophenyl)...
Ferguson, George,Carroll, Christopher D.,Glidewell, Christopher,Zakaria, Choudhury M.,Lough, Alan J.
, p. 367 - 377 (2007/10/02)
(4-Biphenyl)diphenylmethanol (1), C25H20O, orthorhombic, P212121, a = 8.3580(11), b = 13.8976(17), c = 15.5915(12) Angstroem, Z = 4, R = 0.032 for 1146 observations 3?(I)>: the structure contains isolated monomers with no hydrogen bonding.Diphenyl(2-pyridyl)methanol (2), C18H15NO, monoclinic, P21/c, a = 8.1899(8), b = 14.855(2), c = 11.6069(15) Angstroem, β = 96.344(8) deg, Z = 4, R = 0.049 for 879 observations 3?(I)>: the structure consists of isolated monomers in which the intramolecular O-H...N hydrogen-bond motif has graph set S(5). 1,1,3-Triphenylpropyn-1-ol (3), C21H16O, monoclinic, P21/c, a = 5.9794 (12), b = 9.953(3), c = 26.420(3) Angstroem, β = 91.365(12) deg, Z = 4, R = 0.039 for 971 observations 2?(I)>: the structure contains centrosymmetric dimers held together by O-H...?(arene) hydrogen bonds involving one of the phenyl groups, rather than the propargyl group. 2-Methyl-1,1-diphenylpropan-1-ol (4), C16H18O, trigonal, P31c, a = 13.9232(17), c = 12.0200(19) Angstroem, Z = 6, R = 0.031 for 763 observations 3?(I)>: the structure consists of cyclic hydrogen-bonded trimers with crystallographic threefold symmetry and disordered hydroxyl H atoms in a motif with graph set R33(6): the O...O distance in the trimers is 2.864(7) Angstroem.Diphenyl(2-thienyl)methanol (5), C17H14OS, rhombohedral, R, a = 19.20(1), c = 26.48(1) Angstroem, Z = 24; this compound is isomorphous and isostructural with triphenylmethanol, Ph3COH, and forms hydrogen-bonded tetrahedral tetramers.Bis(pentafluorophenyl)methanol (6), C13H2F10O, rhombohedral, R, a = 26.113(3), c = 9.788(3) Angstroem (at 293 K), R = 0.068 for 1214 observations 2?(I)>; a = 26.006(4), c = 9.5941(11) Angstroem (at 173 K), R = 0.072 for 1889 observations 2?(I)>, Z = 18; the structure consits of coaxial stacks of cyclic hydrogen-bonded hexamers, each of symmetry, and with a hydrogen-bond motif of graph set R66(12).Within the hexamers, the molecules are disordered over two orientations in the ratio 0.779(3):0.221(3) at 293 K and 0.776(2):0.224(2) at 173 K: the O...O distance is 2.702(4) Angstroem at 293 K and 2.683(4) Angstroem at 173 K.Diphenylmethanol (7), C13H12O, orthorhombic, P22121, a = 5.1300(10), b = 18.650(5), c = 21.168(6) Angstroem, Z = 8, R = 0.035 for 1487 observations 3?(I)>: there are two molecules in the asymmetric unit and the molecules are linked by hydrogen bonds into spiral chains having graph set C(4) and lying parallel to the a-axis; the O...O distances within the chains are 2.826(3) and 2.878(3) Angstroem.
ELECTRON-TRANSFER REACTIONS OF ORGANOSULFUR CATION RADICALS
Shine, Henry J.,Bae, Dong Hak,Hoque, A. K. M. Mansurul,Kajstura, Alojzy,Lee, Wang Keun,et al.
, p. 111 - 142 (2007/10/02)
The thianthrene cation radical (Th.+) undergoes electron transfer in reactions with a number of azoalkanes.The oxidized azoalkanes then enter primarily into carbocation reaction pathways rather than the free radical pathways with which they are commonly associated.Examples are given with 1,1'-azoadamantane, phenylazotriphenylmethane, azotoluene, and azo-tertiary-butane.Reactions of Th.+ with Grignard agents also result, to varying extents, in electron transfer from the Grignard to Th.+.Here again carbocation chemistry is seen but particularly with solvent tetrahydrofuran, which polymerizes.The Grignard group may end up primarily as alkane (e.g., with t-butyl) or may also be trapped by Th.+ in the form of a 5-alkylthianthreniumyl ion (e.g. with butyl).Possible mechanisms of reactions are discussed.
RADICAL-ANIONS OF AROMATIC COMPOUNDS. V. EFFECT OF THE STRUCTURE OF THE ELECTROPHILE ON THE RATIO OF THE ELECTRON-DONATING AND NUCLEOPHILIC CHARACTERISTICS OF THE BENZOPHENONE RADICAL-ANION IN REACTIONS WITH N,N,N-TRIMETHYLARYLAMMONIUM PERCHLORATES
Selivanov, B. A.,Bil'kis, I. I.,Varand, V. L.,Shteingarts, V. D.
, p. 865 - 877 (2007/10/02)
In reaction with N,N,N-trimethylammonium perchlorates in THF the potassium salt of the benzophenone radical-anion exhibits dual reactivity, acting both as nucleophile (as SN process) and as a one-electron reducing agent (an ET process).The effect of the structure of the aryl fragment of the ammonium salt on the ratio of the rates WET/WSN is determined by the higher sensitivity of the electron transfer rate to the effect of this factor compared with nucleophilic substitution and varies in the following order: p-Methoxyphenyl p-tolyl m-tolyl phenyl m-methoxyphenyl p-biphenylyl m-chlorophenyl 1-naphthyl.I t was found that the structure of the aryl fragment of the ammonium salt has a significant effect on the regioselectivity of the methylation of the benzophenone radical-anion.
