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87336-18-3

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87336-18-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 87336-18-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,3,3 and 6 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 87336-18:
(7*8)+(6*7)+(5*3)+(4*3)+(3*6)+(2*1)+(1*8)=153
153 % 10 = 3
So 87336-18-3 is a valid CAS Registry Number.

87336-18-3Downstream Products

87336-18-3Relevant articles and documents

Sulfur dioxide complexes of iron(0): [Fe(L)2(CO)2(SO2)] (L = P(III) ligand). Isomerism and the structures of [Fe(P(OPh)3)2(CO)2(SO2)] and [Fe(P(OC6H4Me-o)3)2(CO) 2(SO2)]

Conway, Paul,Grant, Seamus M.,Manning,Stephens

, p. 3714 - 3721 (2008/10/08)

A series of air-stable [Fe(L)2(CO)2(SO2)] complexes (L = P(III) ligand) have been prepared either from [Fe(L)2(CO)3] by photolysis and subsequent reaction with SO2 when L is a triaryl phosphite or from [Fe(L)2(CO)2(CS2)] by the thermal or photolytic displacement of CS2 by SO2. Their IR spectra are reported and absorption bands due to ν(CO) and ν(SO2) vibrations are assigned. They show that there are two isomeric forms of these complexes, A and B, and the structures of one of each have been determined by X-ray diffraction studies. In both there is trigonal-bipyramidal coordination about Fe with a planar η1(S)-SO2 ligand coordinated equatorially so that the SO2 plane lies ca. perpendicular to the equatorial plane of the complex. However, in [Fe(P(OPh)3)2(CO)2(SO2)] (an isomer A) the two phosphite ligands are axially coordinated, while in [Fe(P(OC6H4Me-o)3)2(CO) 2(SO2)] (an isomer B) they are equatorial. In the solid state all of the complexes adopt the A configuration except when L = (o-ClC6H4O)3P, (o-MeC6H4O)3P, or Ph(o-MeC6H4O)2P. In solution the complexes are found solely as A when L = (p-ClC6H4O)3P, (i-PrO)3P, Ph(i-PrO)2P, Ph(MeO)2P, Ph2(PhO)P, Ph2(MeO)P, Ph2MeP, and Ph3P. When L = (o-ClC6H4O)3P, only B is observed. However there is a solvent-dependent equilibrium mixture of A and B when L = (o-MeC6H4O)3P, Ph(o-MeC6H4O)2P, (m-MeC6H4O)3P, (p-MeC6H4O)3P, (PhO)3P, Ph(PhO)2P, and Ph2(o-MeC6H4O)P with the proportion of B declining along this series in a particular solvent. It is proposed that this equilibrium is largely a consequence of steric effects. A is destabilized by steric interactions between the SO2 ligand and the ortho-H atoms of the axial L ligands, and B is destabilized by L-L interactions. Electronic factors also play their limited part and arise from the nature of the bonding between all three equatorial ligands and Fe. The structures of two of the complexes were solved by the heavy-atom method and refined by least-squares procedures. [Fe(P(OPh)3)2(CO)2(SO2)] crystals (an example of isomer A) were triclinic, space group P1, or P1, with a = 11.027 (5) A?, b = 11.374 (5) A?, c = 15.238 (8) A?, α = 88.3 (1)°, β = 97.7 (1)°, γ = 108.6 (1)°, and Z = 2, and the structure was refined to R = 0.083 for 2437 non-zero unique photographic reflections. [Fe(P(OC6H4Me-o)3)2(CO) 2(SO2)] crystals (an example of isomer B) were monoclinic, space group Cc or C2/c, with a = 19.873 (11) A?, b = 10.725 (5) A?, c = 20.798 (11) A?, β = 100.7 (1)°, and Z = 4, and the structure was refined to R = 0.088 for 1309 non-zero unique photographic reflections.

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