Bridged Lamellae:  Crystal Structure(s) of Low Molecular Weight Linear Polyethylene

1999 ◽  
Vol 32 (1) ◽  
pp. 162-166 ◽  
Author(s):  
Douglas L. Dorset
Keyword(s):  
Crystal Structure ◽  
Molecular Weight ◽  
Low Molecular Weight ◽  
Linear Polyethylene

Crystal Structure of Bovine Low Molecular Weight Phosphotyrosyl Phosphatase Complexed with the Transition State Analog Vanadate†,‡

Biochemistry ◽  
1997 ◽  
Vol 36 (1) ◽  
pp. 15-23 ◽  
Author(s):  
Marie Zhang ◽  
Ming Zhou ◽  
Robert L. Van Etten ◽  
Cynthia V. Stauffacher
Keyword(s):  
Crystal Structure ◽  
Molecular Weight ◽  
Transition State ◽  
Low Molecular Weight ◽  
Transition State Analog

Melt crystalfization and crystal morphology of two low molecular weight linear polyethylene fractions

1997 ◽  
Vol 36 (5) ◽  
pp. 553-567 ◽  
Author(s):  
Fang-Chyou Chiu ◽  
Qiang Fu ◽  
Mark Leland ◽  
Stephen Z. D. Cheng ◽  
Eric T. Hsieh ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Crystal Morphology ◽  
Low Molecular Weight ◽  
Linear Polyethylene

scholarly journals Synthesis of a Chiral Meso-Like Ansa-Zirconocene Complex and its Use for the Catalytic Formation of Low Molecular Weight Polypropylene

1995 ◽  
Vol 50 (6) ◽  
pp. 982-989 ◽  
Author(s):  
Sven Thiele ◽  
Gerhard Erker ◽  
Cornelia Fritze ◽  
Christian Psiorz ◽  
Roland Fröhlich
Keyword(s):  
Crystal Structure ◽  
Molecular Weight ◽  
Double Bond ◽  
Ambient Temperature ◽  
Organic Synthesis ◽  
Crystal Structure Analysis ◽  
Low Molecular Weight ◽  
X Ray ◽  
Catalyst Systems ◽  
Double Bond Shift

Reaction of lithium(neomenthylcyclopentadienid) 3 with dimethyldichlorosilane gives dimethylbis[3-(neomenthyl)cyclopentadienyl]silane 4 regioselectively as a mixture of double bond shift isomers (57% isolated). Deprotonation with 2 equiv. of butyllithium followed by treatment with zirconiumtetrachloride furnished a mixture of the three {dimethylsilylenbis[η5-3-(neomenthyl)cyclopentadienyl][zirconium dichloride diastereomers from which the pure meso-like isomer 6e [p -R (1′S ,3 ′R ,4 ′R),p -S (1′S ,3 ′R ,4 ′R)] was isolated by fractional crystallization. Complex 6 c was characterized by an X-ray crystal structure analysis. Its D 1 - Zr - D 2 angle of 126.8° is very similar as observed in bis(η-cyclopentadienyl) zirconium dichloride (D 1 and D 2 denote the centroids of the cyclopentadienyl rings). The homogeneous 6c/methylalumoxane Ziegler-type catalyst produces polypropylene of low molecular weight (Mη ≈ 670 at ambient temperature). Related catalyst systems may find interesting applications in organic synthesis.

scholarly journals Crystal structure and putative substrate identification for the Entamoeba histolytica low molecular weight tyrosine phosphatase

2014 ◽  
Vol 193 (1) ◽  
pp. 33-44 ◽  
Author(s):  
Alicia S. Linford ◽  
Nona M. Jiang ◽  
Thomas E. Edwards ◽  
Nicholas E. Sherman ◽  
Wesley C. Van Voorhis ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Molecular Weight ◽  
Entamoeba Histolytica ◽  
Tyrosine Phosphatase ◽  
Low Molecular Weight ◽  
Substrate Identification
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