bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quantitative three‐dimensional power Doppler ultrasound predicts the outcome of placental chorioangioma
Authors: Shih J. C. , Ko T. L. , Lin M. C. , Shyu M. K. , Lee C. N. , Hsieh F. J. 
Published: July 2004

AbstractThe relationship of large and vascularized chorioangiomas to adverse pregnancy outcome is well recognized. We present a patient with a large placental tumor and signs of impending fetal cardiac failure. The angioarchitecture of the tumor depicted by three‐dimensional (3D) power Doppler ultrasound enabled us to accurately diagnose a placental chorioangioma. During the follow‐up period, quantitative flow data obtained using 3D power Doppler indicated altered hemodynamics in the tumor and concomitant improvement in the condition of the fetus, enabling us to manage the mother conservatively. Spontaneous delivery occurred at 38 weeks without any complications. This report demonstrates the potential value of 3D power Doppler in prenatal diagnosis and monitoring of pregnancies complicated by large, vascularized chorioangioma. Copyright © 2004 ISUOG. Published by John Wiley & Sons, Ltd.
Prevalence of neurological damage in monochorionic twins with selective intrauterine growth restriction and intermittent absent or reversed end‐diastolic umbilical artery flow
Authors: Gratacós E. , Carreras E. , Becker J. , Lewi L. , Enríquez G. , Perapoch J. , Higueras T. , Cabero L. , Deprest J. 
Published: July 2004

AbstractObjectiveTo assess the incidence of parenchymal lesions on early and late neonatal brain scans and its association with the presence or absence of intermittent absent or reversed end‐diastolic umbilical artery flow velocity (A/REDV) in monochorionic twins complicated by selective intrauterine growth restriction (IUGR), as compared to dichorionic twins and monochorionic twins without selective IUGR.MethodsThis was a prospective cohort study involving 42 monochorionic twins diagnosed with selective IUGR and managed expectantly. The presence or absence of intermittent A/REDV was recorded in all cases. This study group was compared to dichorionic twins (n = 29) and monochorionic twins without selective IUGR (n = 32) delivered at 26–34 weeks during the study period. All infants underwent an early neonatal brain scan (at or before the fourth day of postnatal life) and at least one follow‐up scan during the first 28 days of postnatal life. Perinatal outcome and the incidence of neurological damage were compared between the study groups.ResultsThe incidence of intrauterine fetal death (IUD) and periventricular leukomalacia was significantly increased in monochorionic twins complicated with selective IUGR, as compared with the other study groups. Intermittent A/REDV was observed in 22/42 (52.4%) twin pairs, and was always present in the growth‐restricted twin. The incidence of IUD (overall 9/44 (20.5%) vs. 0/40, P < 0.001; smaller twin 6/22 (27.3%) vs. 0/20, P < 0.05) and parenchymal brain damage (overall 7/35 (20.0%) vs. 2/40 (5.0%), P = 0.07; larger twin 7/19 (36.8%) vs. 1/20 (5.0%), P < 0.05) was significantly higher in pregnancies with intermittent A/REDV than in those without intermittent A/REDV. Brain damage usually occurred in the larger twin, irrespective of whether the smaller twin was liveborn or not.ConclusionsThe presence of intermittent A/REDV in monochorionic twins with selective IUGR identifies a subgroup with an elevated risk of intrauterine demise of the smaller twin and neurological damage in the larger twin; this latter finding is not restricted to cases with IUD of the cotwin. Copyright © 2004 ISUOG. Published by John Wiley & Sons, Ltd.
Fetal lung dysplasia: clinical outcome based on a new classification system
Authors: Achiron R. , Zalel Y. , Lipitz S. , Hegesh J. , Mazkereth R. , Kuint J. , Jacobson J. , Yagel S. 
Published: July 2004

AbstractObjectiveTo evaluate the clinical application of a new classification system of fetal lung anomalies.MethodsForty fetal diagnoses of lung lesions were analyzed according to our proposed classification system in which each lung component is considered using two‐dimensional ultrasound and color and power Doppler technology. Medical files, natural history and neonatal follow‐up were recorded.ResultsType I dysplasia: Four cases of agenesis of the lung were diagnosed, three with right lung agenesis and one with left lung agenesis. Three of the four patients elected to undergo termination of pregnancy (TOP). The surviving fetus was diagnosed with scimitar syndrome and postnatal embolization of the aberrant vessel was performed. Type II dysplasia: One case of normal lung with abnormal systemic feeding artery was diagnosed with normal neonatal outcome. Type III dysplasia: Abnormal lung with abnormal vascularity was found in 14 cases, presenting in most cases as echogenic lung masses. Seven were supradiaphragmatic, six subdiaphragmatic and one case was of undetermined position. All 14 fetuses showed an aberrant systemic artery emerging from the aorta. Abnormal venous drainage could be identified in only five (36%) of the fetuses: three had prominent azygos vein, one showed drainage to the inferior vena cava and one had multiple intrapulmonary veins forming a huge arteriovenous (A‐V) shunt. Two cases in this group underwent TOP, the case with A‐V shunt following development of hydrops, and one on maternal request. The remaining 12 fetuses (86%) survived and were alive and well at the time of writing; only one of them needed immediate postnatal embolization of the bilateral aberrant feeding arteries. Type IV dysplasia: Abnormal lung with no vascular abnormality was diagnosed in 20 fetuses. In this group there was one case of intrauterine fetal death, two patients underwent TOP, one complicated with hydrops and one on maternal request. The survival rate in this group was 85%. Only two cases needed immediate surgical repair. Type V miscellaneous dysplasia: One fetus demonstrated echogenic lung with split notochord syndrome and survived.ConclusionsCongenital bronchopulmonary and related vascular anomalies can be categorized using the new classification system. This new approach enabled prenatal evaluation of each lung component and facilitated cogent management of the fetus with congenital lung dysplasia. Copyright © 2004 ISUOG. Published by John Wiley & Sons, Ltd.
Prenatal diagnosis of fetal skeletal dysplasias by combining two‐dimensional and three‐dimensional ultrasound and intrauterine three‐dimensional helical computer tomography
Authors: Ruano R. , Molho M. , Roume J. , Ville Y. 
Published: July 2004

AbstractObjectiveTo evaluate the contribution of new imaging techniques in the prenatal diagnosis of skeletal dysplasia.MethodsBetween May and October 2003, a prospective study was conducted in a single referral center. Three‐dimensional ultrasound (3D‐US) and three‐dimensional helical computer tomography (3D‐HCT) were performed after two‐dimensional ultrasound (2D‐US) in six cases of skeletal dysplasia. Diagnostic accuracy and detailed findings with each of the three techniques were compared with postnatal radiological findings.ResultsThere were three cases of achondroplasia, two cases of osteogenesis imperfecta type II and one case of chondrodysplasia punctata. Termination of pregnancy was performed in five cases and one fetus with osteogenesis imperfecta type II was delivered at term by Cesarean section. 2D‐US made the correct diagnosis in four cases. 3D‐US and 3D‐HCT achieved an accurate diagnosis in all six cases. 3D‐HCT and 3D‐US identified significantly more abnormalities than did 2D‐US (3D‐HCT: 94.3% (33/35); 3D‐US: 77.1% (27/35); 2D‐US: 51.4% (18/35); P < 0.01). The diagnosis was made between 27 and 36 weeks' gestation in all cases. The advantage of 3D‐HCT over 3D‐US was the possibility of imaging the entire fetus.Conclusion3D‐US and 3D‐HCT seem to be useful complementary methods to 2D‐US, and may improve accuracy of the prenatal diagnosis of skeletal disorders. These new imaging technologies may have a role in the prenatal multidisciplinary approach to the diagnosis of skeletal dysplasias. Copyright © 2004 ISUOG. Published by John Wiley & Sons, Ltd.
Fetal cerebral venous Doppler velocimetry in normal and high‐risk pregnancy
Authors: Cheema R. , Dubiel M. , Breborowicz G. , Gudmundsson S. 
Published: July 2004

AbstractObjectiveIn previous pilot studies, fetal vein of Galen (GV) blood velocity has been shown to be non‐pulsatile in normal pregnancies. A pulsating pattern in high‐risk pregnancies has been related to adverse outcome of pregnancy. The aim of this study was to establish reference ranges for fetal cerebral venous blood flow and compare them to the recordings in high‐risk pregnancies in terms of predicting adverse perinatal outcome.MethodsThe GV, straight sinus (SS) and transverse sinus (TS) were located by color Doppler ultrasound in 189 normal pregnancies between 23 and 43 weeks of gestation. Recordings were also made in 102 pregnancies complicated by pregnancy‐induced hypertension and/or intrauterine growth restriction. The following parameters were measured: peak systolic velocity, minimum diastolic velocity, time‐averaged maximum velocity, pulsatility index for veins (PIV) and preload index (PLI). GV pulsations were noted. In high‐risk pregnancies, Doppler measurements were correlated to pregnancy outcome, including emergency operative intervention and/or neonatal distress. Umbilical vein and umbilical, uterine and middle cerebral artery blood velocities were also recorded at the same time.ResultsIn normal pregnancy, pulsating venous blood velocity was observed in GV in 8% of cases, in SS in 79% of cases and in TS in 100% of cases. GV and SS maximum velocity increased with gestational age and TS‐PIV showed linear decreasing values and TS‐PLI showed increasing values with gestational age. In high‐risk pregnancies, pulsating blood velocity in the GV was found in 59 (58%) cases and was related to adverse outcome of pregnancy including mortality. Abnormal values for TS‐PIV and PLI and SS maximum velocity were found in nine, six and five cases, respectively and were only related to perinatal mortality. GV pulsations were more frequent than umbilical venous pulsations.ConclusionsOf the fetal cerebral veins studied, the presence of pulsations in the GV seems to be the best predictor of adverse outcome of high‐risk pregnancy. Pulsations in the GV are more frequent than in the umbilical vein and might therefore appear earlier during worsening fetal condition, and thus be of potential value for fetal surveillance in high‐risk pregnancies. Copyright © 2004 ISUOG. Published by John Wiley & Sons, Ltd.
Fetoscopic tracheal occlusion (FETO) for severe congenital diaphragmatic hernia: evolution of a technique and preliminary results
Authors: Deprest J. , Gratacos E. , Nicolaides K. H. 
Published: July 2004

AbstractBackgroundCongenital diaphragmatic hernia (CDH) with liver herniation and a lung area to head circumference ratio (LHR) > 1 is associated with a high rate of neonatal death due to pulmonary hypoplasia.MethodsWe report the development of a minimally invasive and reversible fetoscopic tracheal occlusion (FETO) with a balloon, carried out in 21 consecutive fetuses with severe CDH.ResultsEndotracheal placement of the balloon was successfully performed in all 21 cases and the mean duration of the operation was 20 (range, 5–54) min. The median gestation at FETO was 26 (range, 25–33) weeks. There were no maternal complications such as hemorrhage, placental abruption or pulmonary edema. In 11 (52.4%) patients there was postoperative prelabor amniorrhexis, which occurred within 2 weeks in five patients and after 2 weeks in six patients. Ultrasound scans after FETO demonstrated an increase in the echogenicity of the lungs within 48 h and improvement in the LHR from a median 0.7 (range, 0.4–0.9) before FETO to 1.8 (range, 1.1–2.9) within 2 weeks following surgery. The median gestation at delivery was 34 (range, 27–38) weeks and in 17 (77.3%) patients delivery occurred after 32 weeks. Nine babies died in the neonatal period due to complications from pulmonary hypoplasia. Surgical repair of the diaphragmatic hernia was carried out in 12 babies and in all but one the defect was extensive and required the insertion of a patch. Ten of these babies survived, and at the time of writing were aged 6–25 (median, 18) months and were developing normally. Survival was 30% in the first group of 10 fetuses and 63.6% in the second group of 11 fetuses. The total number of cases was too small for definite conclusions to be drawn as to the causes of this apparent improvement in survival. Nevertheless, improved survival coincided with a shift in the timing of FETO from the third to the second trimester, the administration of epidural rather than general anesthesia, reduced incidence of postoperative amniorrhexis and a change in the policy on the timing of removal of the balloon from the intrapartum to the prenatal period. During the same period of study there were 17 cases examined in the participating centers that met the criteria for FETO but which declined prenatal therapy. In all cases there was isolated left‐sided CDH with liver in the thorax and LHR of 0.4–0.9 (mean, 0.7). In five cases the parents elected to terminate the pregnancy. In the 12 cases with expectant management all babies were liveborn but 11 died in the neonatal period due to pulmonary hypoplasia and only one (8.3%) survived.ConclusionSevere CDH can be successfully treated with FETO, which is minimally invasive and may improve postnatal survival. Copyright © 2004 ISUOG. Published by John Wiley & Sons, Ltd.
Polysulfonylamine. CLXVIII [1]. Kristallstrukturen von Metall‐di(methansulfonyl)amiden. 16 [2]. Ein lineares Koordinationspolymer aus isolierten quadratischen Röhren: Tetragonales Na4[(MeSO2)2N]4·3H2O
Authors: Zerbe Eva‐Maria , Jones Peter G. , Moers Oliver , Blaschette Armand 
Published: July 2004

AbstractDas hydratisierte Natrium‐dimesylamid Na4[(MeSO2)2N]4·3 H2O wurde durch Zufall entdeckt. Die Kristallstruktur (tetragonal, seltene Raumgruppe I41cd, Z′ = 1) enthält eindimensionale quadratische Röhren auf der Grundlage von Na—O‐ und Na—N‐Wechselwirkungen und veranschaulicht, daß auch ein unelegantes Koordinationsnetzwerk zu einer hochästhetischen Kristallsymmetrie führen kann. Jede Röhre wird von vier parallelen Ketten gebildet, die sich durch z‐Translation fortpflanzen. Als isolierte Einheiten würden diese Ketten aus drei μ3‐O, N, O‐verbrückenden Anionen, einem μ2‐O, N‐verbrückenden Anion, drei μ2‐verbrückenden Wassermolekülen und vier Natriumionen mit den Koordinationszahlen 5, 5, 4 und 3 bestehen; bei der Röhrenbildung verhalten sich ein μ3‐ und das einzelne μ2‐Anion passiv („äußere Liganden”︁), die anderen μ3‐Anionen („innere Liganden”︁) erhöhen ihren Verbrückungsmodus auf μ4‐O, O, N, O bzw. μ5‐O, O, N, O, O, und die niedriger koordinierten Kationen gelangen zur Koordinationszahl 5. Bei den Koordinationspolyedern handelt es sich um zwei verzerrte trigonale (O3N2)‐Bipyramiden, eine verzerrte quadratische (O5)‐Pyramide und ein (O5)‐Polyeder zwischen trigonaler Bipyramide und quadratischer Pyramide. Die in koordinationschemischer Hinsicht mangelhaft konstruierten Röhren umhüllen die zweizähligen Drehachsen, wobei benachbarte Ketten in der Röhre durch c‐Gleitspiegelung miteinander in Beziehung stehen. Außerdem finden sich benachbarte Röhren von den vierzähligen Schraubenachsen in der Weise transformiert, daß aufeinanderstoßende Stapel von äußeren Liganden zu Mischstapeln verschmelzen und dichte Packung der Röhren gewährleistet ist. Ein dreidimensionales Netzwerk aus sechs Wasserstoffbrücken O(W)—H···O=S und zahlreichen schwachen H‐Brücken des Typs C—H···O=S verstärkt die Kohäsion des Kristalls; bemerkenswert ist dabei, daß die starken O—H‐Donoren spezifisch mit den sechs nichtkoordinierenden Sulfonyl‐Sauerstoffatomen in Wechselwirkung treten.
Bimetallic Copper(I)‐Mercury(II) and Copper(I)‐Potassium(I) Coordination Polymers with Bridging Di‐ and Trithiacrown Ethers
Authors: Heller M. , Sheldrick W. S. 
Published: July 2004

AbstractThe complex [Hg(SCN)2(1, 10DT18C6)] (1) contains discrete Hg(SCN)2 units, whose Hg atoms lie at the centre of a 1, 10‐dithia‐18‐crown‐6 (1, 10DT18C6) macrocycle. The essentially linear coordination of Hg in Hg(SCN)2 is extended to hexagonal bipyramidal by weak Hg—S bonds of length 3.003(2)Å to the thiacrown ether S atoms and by four additional secondary Hg—O interactions. Solvothermal reaction of CuCN and HgCl2 with 1, 10DT18C6 in acetonitrile at 100 °C affords [(CuCN)4{Hg(CN)2(1, 10DT18C6)}] (2). Zigzag CuCN chains in this complex are linked by 1, 10DT18C6 ligands in a μ‐S1, S10 bridging manner into layers. These, in their turn, are connected through μ‐[Hg(CN)2] units into interpenetrating 3D frameworks, in which the Hg atoms are surrounded by coordinating thiacrown ether macrocycles. [K(Cu3I4)(1, 7, 13TT18C6)]·CH3CN (3) can be prepared by treatment of KI and CuI with 1, 7, 3‐trithia‐18‐crown‐6 (1, 7, 13TT18C6) in acetonitrile at 100 °C and contains anionic layers in which broken cube [Cu3I4]— building units connect three adjacent thiacrown ether ligands. Individual layers are linked into a 3D network by the K+ counter cations.
(Fluoroorgano)fluoroboranes and ‐borates. 11 [1] The Electrochemical Oxidation of Polyfluorophenyltrifluoroborate Anions in Acetonitrile
Authors: Shundrin Leonid A. , Bardin Vadim V. , Frohn Hermann‐Josef 
Published: July 2004

AbstractThe potentials for the electrochemical oxidation of potassium polyfluorophenyltrifluoroborate salts K[C6H5—nFnBF3] (n = 0 — 5) were measured by cyclic voltammetry in CH3CN. In all cases the first oxidation peak corresponded to irreversible processes at the Pt electrode. The good correlation between the observed first oxidation peak potential values, Ep1, and the calculated (RHF, MNDO approximation) vertical ionisation potentials of the polyfluorophenyltrifluoroborate anions, [C6H5—nFnBF3]—, indicates an one‐electron step as first step of the oxidation. The formation of C6F5H and of the adduct BF3·NCCH3 in the potential controlled electrolysis of K[C6F5BF3] in CH3CN is in agreement with this assumption.
Synthesis and Crystal Stucture of a Long‐Chain Thiophosphinic Amide, Me2P(S)NH{C6H4‐p‐[OCO(C6H4‐p‐OC8H17)]}
Authors: Soulivong D. , Matt D. , Harrowfield J. , Toupet L. 
Published: July 2004

AbstractThe two long‐chain dimethylphosphinic amides Me2P(X)NH{C6H4‐p‐[OCO(C6H4‐p‐OC8H17)]} (X = S, O) were synthesized by reacting Me2PNEt2 with H2N{C6H4‐p‐[OCO(C6H4‐p‐OC8H17)]} and by subsequently achieving the appropriate oxidation step (with H2O2 or S8). The sulfido compound was characterized by X‐ray crystallography, proving to be triclinic, space group, P1¯, a = 6.056(2), b = 8.110(2), c = 25.016(5) Å, α = 97.04(2), β = 89.91(2), γ = 102.81(3), V = 1188.6(5) Å3 , Z = 2. In the solid state, the molecule adopts a bent structure with a length of ca. 24 Å.
Intramolekular stickstoffstabilisierte Organoaluminiumverbindungen mit Naphthyl‐, Benzyl‐ und Phenylliganden
Authors: Schumann Herbert , Dechert Sebastian , Hummert Markus , Lange Katharina C. H. , Schutte Stefan , Wassermann Birgit C. , Köhler Katrin , Eichhorn Jens 
Published: July 2004

AbstractN, N‐Dimethylnaphthylamin (1) reagiert mit Butyllithium zu Li(Et2O)C10H6NMe2‐8 (2). Die Umsetzung von 2 mit Et2AlCl und EtAlCl2 führt zu Et2AlC10H6NMe2‐8 (3) bzw. EtAl(C10H6NMe2‐8)2 (5) und mit iBu2AlCl wird iBu2AlC10H6NMe2‐8 (4) gebildet. 1 reagiert mit Me3Al zum entsprechenden Addukt Me3Al←N(C10H7)Me2 (6). LiCH2C6H4NMe2‐2 (7) und LiC6H4CH2NR2‐2 (R = Me (10), Et (12)) reagieren mit Me2AlCl, Et2AlCl und iBu2AlCl unter Bildung von R2AlCH2C6H4NMe2‐2 (R = Me (8), Et (9)), iBu2AlC6H4CH2NMe2‐2 (11) und Et2AlC6H4CH2NEt2‐2 (13). Die neuen Verbindungen wurden durch Elementaranalysen, 1H‐, 13C‐ und 27Al‐NMR‐Untersuchungen sowie massenspektrometrisch, 3 (zwei Modifikationen), 5 und 6 darüberhinaus durch Einkristall‐Röntgenstrukturanalyse charakterisiert.
Hydrothermal Synthesis of Three New Transition Metal Complexes with Azido Ligands
Authors: He Xiang , Lu Can‐Zhong , Yu Ya‐Qin , Chen Shu‐Mei , Wu Xiao‐Yuan , Yan Ying 
Published: July 2004

AbstractHydrothermal reactions of NaN3, 1, 10‐phenanthroline or 2, 2′‐bipyridine and transition metal cations including ZnII or CoII in basified aqueous solutions yielded the three complexes, [Zn2(bipy)2(N3)4]n (1), [Zn(phen)(N3)2]n (2), and [Co(phen)2(N3)2] (3), which were characterized by X‐ray crystallography. All three complexes crystallize in the triclinic system, space group P1¯, with a = 6.5506(2), b = 10.8441(6), c = 16.893(2)Å, α = 96.333(5), β = 95.361(7), γ = 90.548(6)° for 1; a = 7.0302(10), b = 10.0590(14), c = 10.4550(15)Å, α = 109.372(2), β = 103.980(2), γ = 106.137(2)° for 2; and a = 8.1722(2), b = 11.0332(3), c = 12.5066(2)Å, α = 82.681(8), β = 82.457(9), γ = 72.991(7)° for 3, respectively. The photoluminescence spectra for compounds 1 and2 have also been studied.
Paramagnetic Octahedral p‐Methoxyphenyldithiophosphonato Nickel(II) Complexes: Crystal Structures of [Ni{S2P(OR)(p‐CH3O‐C6H4)‐κS, S′}2(L‐κN)2] (R = Et, 2, 4‐tBu2C6H3, L = 3‐acetylpyridine)
Authors: Karakus Mehmet , Lönnecke Peter , Hey‐Hawkins Evamarie 
Published: July 2004

AbstractThe square‐planar NiII complexes [Ni{S2P(OR)(p‐CH3O‐C6H4)‐κS, S′}2] react with 3‐acetylpyridine to give green crystals of the paramagnetic octahedral complexes [Ni{S2P(OR)(p‐CH3O‐C6H4)‐κS, S′}2(L‐κN)2] [R = Et (1), iPr (2), 2, 4‐tBu2C6H3 (3); L = 3‐acetylpyridine]. Complexes 1‐3 were characterized by IR, MS, and UV‐vis spectroscopy, and crystal structures were determined for 1 and 3. The magnetic moments for 1‐3 are 3.04‐3.15 B.M.
Zinc Complexes from Bromo Substituted Tris[(2‐pyridyl)methyl]amine Ligands. Influence of Sterically Demanding Substituents on Coordination Geometry
Authors: Schnieders David , Merkel Michael , Baldeau Sascha M. , Krebs Bernt 
Published: July 2004

AbstractThe reaction of zinc chloride with the tripodal tetradentate ligand [(6‐bromo‐2‐pyridyl)methyl]bis[(2‐pyridyl)methyl]amine (Brtpa), bis[(6‐bromo‐2‐pyridyl)methyl][(2‐pyridyl)methyl]amine (Br2tpa), or bis[(2‐pyridyl)methyl][(1‐methylimidazol‐2‐yl)methyl]amine (bpia) yields the new coordination compounds [Zn(Brtpa)Cl2] (1), [Zn(Br2tpa)Cl2] (2) and the first zinc compound derived from bpia [Zn(bpia)Cl]2[ZnCl4]·2CH3OH (3), respectively. 1 and 2 are the first zinc complexes with halogen substituted tripodal ligands of the tpa type. The bromine substitutions of the ligands have a strong effect on coordination and binding. The new compounds were isolated and characterized by single crystal X‐ray crystallography as well as infrared spectroscopy and elemental analyses. Compound 1 crystallizes in the triclinic space group P1¯ (No. 2) with a = 7.503(2) , b = 8.815(2) , c = 15.924(3)Å, α = 94.19(3)°, β = 92.33(3)°, γ = 112.32(3)°, V = 969.1(3)Å3, Z = 2. Compound 2 crystallizes in the monoclinic space group P21 (No. 4) with a = 8.357(1), b = 10.882(1), c = 11.286(1)Å, β = 99.04(1)°, V = 1013.7(2)Å3, Z = 2. Compound 3 crystallizes in the orthorhombic space group P212121 (No. 19) with a = 14.367(1), b = 17.269(1), c = 17.479(1)Å, V = 4336.5(2)Å3, Z = 4.
Beiträge zum Reaktionsverhalten von Phosphaalkinen gegenüber Übergangsmetallkomplexen — Synthese und Kristallstrukturanalyse von [(Ph3P)2Pt(η2‐PCMes)], [M(CO)3(η4‐P2C2Mes2)] (M = Fe, Ru), [Cp*Mo(CO)Cl(η4‐P2C2tBu2)] und [K(tol)2]2[Mn(CO)4{Mn(CO)3(η4‐P2C2tBu2)}2]2
Authors: Himmel Daniel , Seitz Markus , Scheer Manfred 
Published: July 2004

AbstractDie Reaktion von MesC≡P (Mes = 2, 4, 6‐Me3C6H2) mit [(Ph3P)2Pt(η2‐C2H4)] führt zu [(Ph3P)2Pt(η2‐PCMes)] (1) während mit Fe2(CO)9 bzw. [Ru(CO)4(C2H4)] die 1, 3‐Diphosphetkomplexe [M(CO)3(η4‐P2C2Mes2)] (M = Fe(2), Ru(3)) und [Ru(CO)3(η4:η1‐P2C2Mes2){Ru(CO)2(η4‐P2C2Mes2)}] (4) gebildet werden. Weiterhin wurde das Reaktionsverhalten von t‐BuC≡P untersucht, wobei mit [Cp*Mo(CO)3Cl] der Komplex [Cp*Mo(CO)Cl(η4‐P2C2tBu2)] (6) erhalten wurde und mit K[Mn(CO)5], [K(tol)2]2[Mn(CO)4{Mn(CO)3(η4‐P2C2tBu2)}2]2 (7) (tol = Toluol) isoliert werden konnte. Die Reaktionsprodukte wurden durch Röntgenstrukturanalyse (außer 4) sowie mit spektroskopischen Methoden umfassend charakterisiert.