Labelling of [Leu5]-enkephalin with organometallic Mo complexes by solid-phase synthesisElectronic supplementary information (ESI) available: full analytical data for 2–4. See http://www.rsc.org/suppdata/cc/b2/b203128k/Abbreviations: HMBA = hydroxymethylbenzoic acid; 2-Cl-Trt = 2-chlorotrityl; TFA = trifluoroacetic acid; TIS = triisopropylsilane; TBTU = O-(1H-benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium tetrafluoroborate; Enk = leucine-enkephalin, [Leu5]-enkephalin; HOBt = hydroxybenzotriazole.

2002 ◽  
pp. 1406-1407 ◽  
Author(s):  
Dave R. van Staveren ◽  
Nils Metzler-Nolte
Keyword(s):  
Trifluoroacetic Acid ◽  
Solid Phase ◽  
Analytical Data ◽  
Supplementary Information ◽  
Leucine Enkephalin

Analysis of Physical Structure and Chemical Composition of Oil-Water Transition Layer in Oil Gathering and Transportation System

2013 ◽  
Vol 652-654 ◽  
pp. 2566-2569
Author(s):  
Dan Dan Yuan ◽  
Hong Jun Wu ◽  
Hai Xia Sheng ◽  
Bao Hui Wang ◽  
Xin Sui
Keyword(s):  
Chemical Composition ◽  
Transition Layer ◽  
Suspended Solids ◽  
Solid Phase ◽  
Freezing Point ◽  
Analytical Data ◽  
Transportation System ◽  
Physical Structure ◽  
Efficient Treatment ◽  
Oil Water

he existence of oil-water transition layer brings a great trouble to the dehydration of oil gathering and transportation system. It leads to raising the electric current of dehydrator and becoming worse of the deoiling and dehydrating properties of the treatment equipment, resulting in the serious influences on oil recovery. For the efficient treatment of the transition layer, it is necessary clearly to understand the structure and composition of the layer. In this paper, the physical structure and chemical composition of the layer were systematically, layer by layer and phase by phase, analyzed by modern instrumental methods The results show that (1）the layer is an emulsion which is composed of oil, water and suspended solids. The water phase has characteristics of weak alkaline，high salinity and viscous polymer. The oil phase contains many natural emulsifiers such as colloid, asphaltene and so on. The solid phase mainly concludes FeS particle which plays a decisive role in suspended solids; (2) the typical transition layer is composed of water and oil which accounts for above 90%, the content of solid impurity, which controls the emulsion of the layer, is less than 10%. Compared with oil phase, the water content of typical transition layer is larger with the density of 0.9~1.0 g/L and high freezing point. The analytical data can be adopted for the treatment of oil-water transition layer and smoothly run operations for oil gathering and transportation.

Festphasensynthese von Muramyldipeptiden an isomeren Trialkoxybenzylamin-Harzen / Solid Phase Synthesis of Muramyl Dipeptides on Isomeric Trialkoxybenzylamine Resins

1998 ◽  
Vol 53 (7) ◽  
pp. 753-764 ◽  
Author(s):  
Hans-Jürgen Kohlbaua ◽  
Jochen Tschakert ◽  
Raed A. Al-Qawasmeh ◽  
Tanveer Ahmad Nizamì ◽  
Abdul Malik ◽  
...  
Keyword(s):  
Amino Acids ◽  
Trifluoroacetic Acid ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Subsequent Treatment ◽  
Phase Synthesis ◽  
Merrifield Resin

Abstract New isomeric trialkoxybenzylamine resins are developed coupling phthalimidomethyl-3,5-dimethoxyphenols to the Merrifield resin, followed by subsequent treatment with hydrazine. The generated benzylamine function allows DCC coupling w ith the carboxyl function of amino acids and peptides which are removed as amides after treatment with trifluoroacetic acid. These new trialkoxybenzylamine resins allow expeditious syntheses of peptide amides and glycopeptide amides as is demonstrated for muramyl peptides and analogues.

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