Results 171 to 180 of about 13,564 (218)
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Shear Elastic Constant C44 and Phase Transformation of KCl
Nature, 1973THE shear elastic constant C44 for KCl, KF and the rubidium halides is of special interest because it decreases with pressure. Born1 and Misra2 pointed out that a vanishing shear elastic constant is a sufficient condition for a phase transformation.
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Intermediates for Larger Endohedral Metallofullerenes: Theoretical Characterization of M@C44 Species
Journal of Physical Chemistry C, 2018 Endohedral metallofullerenes M@C44 containing several different endohedral species have been considered as intermediates in the path to form larger species. Such compounds containing interstitial atoms of groups 3 and 4, recently detected in experiments,
Alvaro Muñoz-Castro +2 more
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C44. Bayes's Billiard-Table Argument Extended to Multinomials
Journal of Statistical Computation and Simulation, 1979I J Good
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On the softening of the elastic constant, C44, in graphite
Solid State Communications, 1979Abstract The shear mode associated with the interplanar elastic parameter C 44 of graphite is anomalously soft in the low frequency region. An analysis of dislocation dynamics has been made and several experiments are described which explore the temperature, pressure and magnetic field dependence of C 44 .
J.B. Ayasse +4 more
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Synthesis of the C29−C44 Portion of Spongistatin 1 (Altohyrtin A)
The Journal of Organic Chemistry, 2000Two synthetic approaches to the C29-C44 portion of spongistatin 1 (altohyrtin A) have been developed. The key step of the first approach relies on the Claisen rearrangement of glucal 18 to provide ester 20a. This intermediate was advanced to silyl enol ether 30, which was coupled under Mukaiyama aldol conditions with aldehyde 3.
G A, Wallace, R W, Scott, C H, Heathcock
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Stereoselective synthesis of the C33–C44 fragment of palau’amide
Tetrahedron Letters, 2008Abstract An efficient stereoselective synthesis of the C33–C44 fragment of palau’amide is described using a Sharpless asymmetric epoxidation, a regioselective nucleophilic ring opening of the epoxide, a Grignard reaction and a Luche stereoselective reduction of a keto compound as the key steps.
Debendra K. Mohapatra, Sabita Nayak
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Relative Energetics of C44 Fullerene Isomers
1992We have carried out an exhaustive search of the energetics of all 87 isomers of the fullerene C44 using an empirical potential function. We find no single structural isomer with exceptional stability, suggesting that the enhanced abundance of this cluster observed in some studies may be due to a mixture of different molecules.
M. Lyons +6 more
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A Method for Constructing the C44−C51 Side Chain of Altohyrtin C
Organic Letters, 1999[formula: see text] A method to construct the C44-C51 side chain of altohyrtin C has been developed and applied to a model aldehyde derived from D-glucose. The approach relies on a Wittig reaction to couple the side chain to an aldehyde and utilizes an allylic diazene rearrangement to place the C45 double bond in the correct position.
G R, Ott, C H, Heathcock
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The Role of Softening in Elastic Constant c44 in Martensitic Transformation
Scripta Materialia, 1998In the present paper, the authors show that the puzzling monoclinic distortion in TiNi martensite B19{prime} has a simple origin. It is due to the softening of {l_brace}001{r_brace} shear modulus c{sub 44} (which is also the {l_brace}001{r_brace} shear modulus by definition), which leads to a correlation of this shear mode with that of basal shear ...
Xiaobing Ren, Kazuhiro Otsuka
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