ZfN: Search Results

1	Author	Z. Naturforsch	Requires cookie*
	Title	Organosubstituierte
	Abstract	l,6,2,5-Azoniathiasilaboratabicyc!o[3.3.0]oct-3-ene -Herstellung und Kristallstruktur [1] O rg anosubstituted 1,6,2,5-A zoniathiasilaboratabicyclo[3.3.0]oct-3-enes -P rep aratio n and Crystal Structure [1] R oland K östera *, G ü n te r Seidel3, B ernd W rackm eyerb, R oland B oesec The heterocycles MeNSi(Me2)C(R3)=C (Et)B Et [R3 = Me: A; R3 = C(M e)=CH 2: B] react with 2-aminoethanet'nioi (i) by elimination of M eNH 2 to give the monocyclic H N CH 2CH2SSi(Me2)C (R)=C (Et)B Et [R = Me: 3a; R = C(M e)=CH 2: 3b] and the ther-mically more stable bicyclic compounds H NSi(Me2)C (R)=C (E t)B (E t)SC H 2CH 2 [R = Me: 4a; R = C(M e)=CH2: 4b], 4a crystallizes in the monoclinic space ^ ro u p P2i/c [lattice con stants (at 120 K) a = 9.3239(10), b = 8.9225(11), c = 17.3958(23) A; ß = 92.207(9)°] with a folded bicyclic ring system. c/s-ClB(Et)C=C(M e)Si(M e2)Cl (C) and Na2-lB E t3 (prepared from 1 and N aH BEt3) form by elimination of M eNH2 preferentially 3 a and minor amounts of 4a. A reacts with o-aminothiophenol (2) via H NSi(Me2)C(M e)=C (Et)B (Et)S(oC 6H 4) (5) to NSi(Me2)C(M e)=C(Et)BS(oC6H 4) (6) and the products 7-10.
	Reference	Z. Naturforsch. 50b, 959—968 (1995); eingegangen am 24. November 1994
	Published	1995
	Keywords	2, 5-Dihydro-l, 2, 5-azasilaboroles, Am inothioalkanes(arenes), Bicyclic Heterocycles, Crystal Structure
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_B/50/ZNB-1995-50b-0959.pdf
	Identifier	ZNB-1995-50b-0959
	Volume	50

2	Author	KenjiM. Atsui, H. Iroyuki, S. Hinta, T. Adahiko, K. Ajiwara, A. Kikazu, H. Atan Ak	Requires cookie*
	Title	Effect of Modification of Arginine Residues on the Activity of Soybean Lipoxygenase-1
	Abstract	Arginine residues of soybean lipoxygenase-1 was modified with an arginine-directed chemical modifier, 2,3-butanedione. Although inactivation was not visible if the enzyme reac tion was monitored under the standard assay condition (83.3 \|.im linoleic acid dispersed in 200 mM sodium borate, pH 9.0), rapid inactivation was observed with 5 mM sodium borate, pH 8.0. The inactivation was protected by the addition of a substrate, linoleic acid, in the modification mixture. Kinetic analyses indicated that one arginine residue accounted for the inactivation. Enzymological analyses showed that the modification narrowed the pH-activity profile of L-l and made L-l sensitive to salt concentration of the assay solution. Strong inactivation by modification was found at low salt concentration and low pH. This was not due to a physical change of the linoleic acid. On the other hand, product specificity of L-l was not altered after modification. Taken together, the modified arginine residue(s) was thought to be not essential to the catalysis but have an important role in supporting an ideal electrostatic interaction within L-l and/or between L-l and a substrate even in sub-optimal reaction conditions.
	Reference	Z. Naturforsch. 50c, 37—4 (1995); received September 26/November 8 1994
	Published	1995
	Keywords	Arginine, 2, 3-Butanedione, Modification, Soybean Lipoxygenase-1
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_C/50/ZNC-1995-50c-0037.pdf
	Identifier	ZNC-1995-50c-0037
	Volume	50

3	Author	E. K. Yudin, K. V. Domasevitch, E. B. Rusanov	Requires cookie*
	Title	Crystal and Molecular Structure of Isonitrosomalonodiamido- (2,2-dipyridyl)copper(II), Chloride Monohydrate [Cu(Dipy){ONC(CONH2)2}Cl] H20
	Abstract	The crystal and molecular structure of the complex [Cu(Dipy){NDA}Cl] • H 20 , where (NDA) = {ONC(CONH2)2}~ anion (space group P I, triclinic, with a = 7.834(1), b = 9.923(1), c = 9.952(1)A, a = 93.60(1), ß = 93.65(1), y = 92.72(1)°, Z = 2) has been determined from X-ray diffraction data. The structure was refined to R -0.029 for 2243 reflections with I>3ct(I). The coordination polyhedron of Cu2+ can be described as a distorted square pyra mid with a chlorine atom in the apex, and with the central atom situated 0.258(3) A above the base of the pyramid towards the chlorine atom. The complicated system of hydrogen bonding involving the water of crystallization connects copper complex units in to the chains in the c direction.
	Reference	Z. Naturforsch. 50b, 864—866 (1995); received O ctober 17 1994
	Published	1995
	Keywords	Copper(II), Oximes, 2, 2-Dipyridyl, X-Ray Spectra
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_B/50/ZNB-1995-50b-0864.pdf
	Identifier	ZNB-1995-50b-0864
	Volume	50