bluuebunny/crossref_metadata_2025_split huggingface dataset:
Bayesian methods for analysis of binary outcome data in cluster randomized trials on the absolute risk scale
Authors: Thompson Simon G. , Warn David E. , Turner Rebecca M. 
Published: January 2004

AbstractA Bayesian hierarchical modelling approach to the analysis of cluster randomized trials has advantages in terms of allowing for full parameter uncertainty, flexible modelling of covariates and variance structure, and use of prior information. Previously, such modelling of binary outcome data required use of a log‐odds ratio scale for the treatment effect estimate and an approximation linking the intracluster correlation (ICC) to the between‐cluster variance on a log‐odds scale. In this paper we develop this method to allow estimation on the absolute risk scale, which facilitates clinical interpretation of both the treatment effect and the between‐cluster variance. We describe a range of models and apply them to data from a trial of different interventions to promote secondary prevention of coronary heart disease in primary care. We demonstrate how these models can be used to incorporate prior data about typical ICCs, to derive a posterior distribution for the number needed to treat, and to consider both cluster and individual level covariates. Using these methods, we can benefit from the advantages of Bayesian modelling of binary outcome data at the same time as providing results on a clinically interpretable scale. Copyright © 2003 John Wiley & Sons, Ltd.
Modelling clustered survival data from multicentre clinical trials
Authors: Glidden David V. , Vittinghoff Eric 
Published: January 2004

AbstractIn randomized clinical trials, subjects are recruited at multiple study centres. Factors that vary across centres may exert a powerful independent influence on study outcomes. A common problem is how to incorporate these centre effects into the analysis of censored time‐to‐event data. We survey various methods and find substantial advantages in the gamma frailty model. This approach compares favourably with competing methods and appears minimally affected by violation of the assumption of a gamma‐distributed frailty. Recent computational advances make use of the gamma frailty model a practical and appealing tool for addressing centre effects in the analysis of multicentre trials. Copyright © 2004 John Wiley & Sons, Ltd.
Estimating linear regression models in the presence of a censored independent variable
Authors: Austin Peter C. , Hoch Jeffrey S. 
Published: January 2004

AbstractThe current study examined the impact of a censored independent variable, after adjusting for a second independent variable, when estimating regression coefficients using ‘naïve’ ordinary least squares (OLS), ‘partial’ OLS and full‐likelihood models. We used Monte Carlo simulations to determine the bias associated with all three regression methods. We demonstrated that substantial bias was introduced in the estimation of the regression coefficient associated with the variable subject to a ceiling effect when naïve OLS regression was used. Furthermore, minor bias was transmitted to the estimation of the regression coefficient associated with the second independent variable. High correlation between the two independent variables improved estimation of the censored variable's coefficient at the expense of estimation of the other coefficient. The use of ‘partial’ OLS and maximum‐likelihood estimation were shown to result in, at most, negligible bias in estimation. Furthermore, we demonstrated that the full‐likelihood method was robust under misspecification of the joint distribution of the independent random variables. Lastly, we provided an empirical example using National Population Health Survey (NPHS) data to demonstrate the practical implications of our main findings and the simple methods available to circumvent the bias identified in the Monte Carlo simulations. Our results suggest that researchers need to be aware of the bias associated with the use of naïve ordinary least‐squares estimation when estimating regression models in which at least one independent variable is subject to a ceiling effect. Copyright © 2004 John Wiley & Sons, Ltd.
Determinants of bribery in international business
Authors: Sanyal Rajib N. , Samanta Subarna K. 
Published: January 2004

AbstractLevels of perceived bribe taking in 54 countries in two time periods were analyzed with respect to two
independent variables—their level of human development measuring education, wealth, and health (Human
Development Index) and the level of economic freedom measuring the extent to which a nation's economy
is open to market forces. The results indicate that lower levels of bribe taking are associated with high human
development and greater economic freedom. Developed countries that have shown improvements on the two variables
over a five‐year period also show a reduction in their perceived levels of bribe taking. © 2004 Wiley
Periodicals, Inc.
Investment and marketing strategies of Mexican companies in the United States: Preliminary evidence
Authors: Vasquez‐Parraga Arturo Z. , Felix Reto 
Published: January 2004

AbstractBecause of its geographic proximity to the United States and its favored position as a member of the North
American Free Trade Agreement (NAFTA), Mexico has become an emerging player in the global marketplace,
and this new position has motivated several Mexican companies to establish businesses in the United States.
Attempts have been made to explain why Mexican firms have become global players, explanations that focus on
several national and international factors. However, these factors omit important drivers of the process,
including entry and marketing strategies. This study aims to 1) give an account of how and why Mexican
companies enter the United States, and 2) identify some tendencies in the way U.S. subsidiaries of Mexican
companies develop and use marketing strategies to serve U.S. markets. © 2004 Wiley Periodicals, Inc.
Entrepreneurship and international business
Authors: Jadoon Zafar Iqbal , Khan Atif Rahim 
Published: January 2004

AbstractHenry Wai‐chung Yeung. 2002. Entrepreneurship and the Internationalisation of Asian Firms: An
Institutional Perspective. Northampton, MA: Edward Elgar Publishing Limited. 311 pages. ISBN
1‐84064‐734‐5.Victoria E. Bonnell & Thomas B. Gold (Eds.). 2002. The New Entrepreneurs of Europe and
Asia: Patterns of Business Development in Russia, Eastern Europe and China. Armonk, NY: M.E. Sharpe.
357 pages. ISBN 0‐7656‐0775‐1.
A DNA microarray for fission yeast: minimal changes in global gene expression after temperature shift
Authors: Xue Yongtao , Haas Stefan A. , Brino Laurent , Gusnanto Arief , Reimers Mark , Talibi Driss , Vingron Martin , Ekwall Karl , Wright Anthony P. H. 
Published: January 2004

AbstractCompletion of the fission yeast genome sequence has opened up possibilities for post‐genomic approaches. We have constructed a DNA microarray for genome‐wide gene expression analysis in fission yeast. The microarray contains DNA fragments, PCR‐amplified from a genomic DNA template, that represent > 99% of the 5000 or so annotated fission yeast genes, as well as a number of control sequences. The GenomePRIDE software used attempts to design similarly sized DNA fragments corresponding to gene regions within single exons, near the 3′‐end of genes that lack homology to other fission yeast genes. To validate the design and utility of the array, we studied expression changes after a 2 h temperature shift from 25 °C to 36 °C, conditions widely used when studying temperature‐sensitive mutants. Obligingly, the vast majority of genes do not change more than two‐fold, supporting the widely held view that temperature‐shift experiments specifically reveal phenotypes associated with temperature‐sensitive mutants. However, we did identify a small group of genes that showed a reproducible change in expression. Importantly, most of these corresponded to previously characterized heat‐shock genes, whose expression has been reported to change after more extreme temperature shifts than those used here. We conclude that the DNA microarray represents a useful resource for fission yeast researchers as well as the broader yeast community, since it will facilitate comparison with the distantly related budding yeast, Saccharomyces cerevisiae. To maximize the utility of this resource, the array and its component parts are fully described in On‐line Supplementary Information and are also available commercially. Copyright © 2003 John Wiley & Sons, Ltd.
KlSEC53 is an essential Kluyveromyces lactis gene and is homologous with the SEC53 gene of Saccharomyces cerevisiae
Authors: Staneva Dessislava , Uccelletti Daniela , Farina Francesca , Venkov Pencho , Palleschi Claudio 
Published: January 2004

AbstractPhosphomannomutase (PMM) is a key enzyme, which catalyses one of the first steps in the glycosylation pathway, the conversion of D‐mannose‐6‐phosphate to D‐mannose‐1‐phosphate. The latter is the substrate for the synthesis of GDP‐mannose, which serves as the mannosyl donor for the glycosylation reactions in eukaryotic cells. In the yeast Saccharomyces cerevisiae PMM is encoded by the gene SEC53 (ScSEC53) and the deficiency of PMM activity leads to severe defects in both protein glycosylation and secretion. We report here on the isolation of the Kluyveromyces lactis SEC53 (KlSEC53) gene from a genomic library by virtue of its ability to complement a Saccharomyces cerevisiae sec53 mutation. The sequenced DNA fragment contained an open reading frame of 765 bp, coding for a predicted polypeptide, KlSec53p, of 254 amino acids. The KlSec53p displays a high degree of homology with phosphomannomutases from other yeast species, protozoans, plants and humans. Our results have demonstrated that KlSEC53 is the functional homologue of the ScSEC53 gene. Like ScSEC53, the KlSEC53 gene is essential for K. lactis cell viability. Phenotypic analysis of a K. lactis strain overexpressing the KlSEC53 gene revealed defects expected for impaired cell wall integrity. The sequence of the KlSEC53 has been deposited in the EMBL database under Accession No. AJ428418. Copyright © 2003 John Wiley & Sons, Ltd.
Positive and negative selection LYS5MX gene replacement cassettes for use in Saccharomyces cerevisiae
Authors: Ito‐Harashima Sayoko , McCusker John H. 
Published: January 2004

AbstractNovel MX cassettes are described that contain the open reading frames (ORFs) of Saccharomyces cerevisiae or Candida albicans LYS5. The LYS5MX and CaLYS5MX cassettes, the targeting efficiencies of which are equivalent to those of other MX cassettes, are positively selected for Lys+ in a lys5 background. Unlike most of the other MX cassettes, the LYS5MX cassettes are also negatively selectable (α‐aminoadipate‐resistant), which will allow the use of the LYS5MX cassettes in plasmid shuffling and will also greatly facilitate marker recycling. Copyright © 2003 John Wiley & Sons, Ltd.
Phase Transition of a Dicyanamide with Rutile‐like Structure: Syntheses and Crystal Structures of α‐ and β‐Cd[N(CN)2]2
Authors: Jürgens Barbara , Irran Elisabeth , Höppe Henning A. , Schnick Wolfgang 
Published: January 2004

AbstractCadmium dicyanamide Cd[N(CN)2]2 was synthesized through aqueous ion exchange at room temperature. A reversible phase transition was detected by in situ X‐ray powder diffractometry above 55 °C. The crystal structures of both phases were determined by X‐ray powder diffraction (β‐Cd[N(CN)2]2: T = 22 °C, a = 621.60(3), b = 748.76(4), c = 770.21(5) pm, β = 91.784(3)°, P21/n (no. 14), Z = 2, wRp = 0.063, Rp = 0.050, RF = 0.059; α‐Cd[N(CN)2]2: T = 150 °C, a = 624.62(5), b = 752.92(6), c = 768.30(7) pm, Pnnm (no. 58), Z = 2, wRp = 0.083, Rp = 0.064, RF = 0.087). Both polymorphs consist of Cd2+ and bent planar [N(CN)2]— ions. α‐Cd[N(CN)2]2 crystallizes analogously to rutile and is isotypic with MII[N(CN)2]2(M = Mg, Cr, Mn, Co, Ni, Cu). The monoclinic low‐temperature polymorph β‐Cd[N(CN)2]2 is closely related to that of the orthorhombic high‐temperature polymorph α‐Cd[N(CN)2]2 by a translationengleiche transition of index 2.
Kristallstruktur des Zinkamids Zn[N(SiMe3)2]2
Authors: Margraf G. , Lerner H.‐W. , Bolte M. , Wagner M. 
Published: January 2004

AbstractCrystal Structure of the Zinc Amide Zn[N(SiMe3)2]2X‐ray quality crystals of Zn[N(SiMe3)2]2 (monoclinic, P21/c) are obtained by sublimation of the zinc amide Zn[N(SiMe3)2]2 at —30 °C in vacuo (300 torr). According to the result of the X‐ray structural analysis, Zn[N(SiMe3)2]2 contains an almost linear N‐Zn‐N unit with two short N‐Zn bonds.
Synthesis and Structural Characterization of the Helical Coordination Polymers [Co(phen)(oba)(H2O)2] and [Cd3(phen)3(oba)2(Hoba)2(H2O)2] (phen = 1, 10‐phenanthroline; oba = 4, 4′‐oxybis(benzoate)
Authors: Zheng Yan‐Zhen , Liu Gao‐Feng , Ye Bao‐Hui , Chen Xiao‐Ming 
Published: January 2004

AbstractTwo coordination polymers, [Co(phen)(oba)(H2O)2] (1) and [Cd3(phen)3(oba)2(Hoba)2(H2O)2] (2) (oba = 4, 4′‐oxybis(benzoate), phen = 1, 10‐phenanthroline) have been synthesized under hydrothermal conditions. Complex 1 crystallizes in monoclinic, P21/n, a = 7.543(6), b = 33.05(2), c = 9.902(5)Å, β = 103.69(2)°, V = 2398(3)Å3, Z = 4; 2 in monoclinic, P2/n, a = 15.11(1), b = 10.069(8), c = 28.02(2)Å, β = 101.83(1)°, V = 4174(5)Å3, Z = 2. X‐ray single‐crystal diffraction investigations shows that the complexes 1 and 2 consist of helical chains, which are further assembled into layers and networks via supramolecular interactions such as π—π stacking interactions and hydrogen bonds, respectively. The results indicate that the coordination environment is one of the most important factors for assembly of single‐stranded helical chains into double‐stranded helical chains via supramolecular interactions.
Synthesis, Crystal Structure, and Spectroscopic Characterization of the Borazine Derivatives [B{CH2(SiCl3)}NH]3 and [B{CH2(SiCl2CH3)}NH]3
Authors: Jäschke Thomas , Jansen Martin 
Published: January 2004

AbstractThe borazine derivatives B, B′, B″‐tris[(trichlorosilyl)methyl]borazine [B{CH2(SiCl3)}NH]3 (1), and B, B′, B″‐tris[{dichloro(methyl)silyl}methyl]borazine [B{CH2(SiCl2CH3)}NH]3 (2) were prepared by reacting (Cl3Si)CH2(BCl2) (3) and [Cl2(CH3)Si]CH2(BCl2) (4) with hexamethyldisilazane (hmds), respectively. Both compounds, 1 and 2 crystallize in space group R3c with a = 1712.53(4), c = 1230.33(4) pm, Z = 6, R1 = 0.030, and a = 1713.8(2), c = 1258.7(2) pm, Z = 6, R1 = 0.034, respectively. According to the single crystal X‐ray diffraction analyses, the title compounds show a planar B3N3 six‐membered ring with B—N distances of 142.3(3) pm (point symmetry C3) and synfacial oriented substituents. The borazine derivatives have also been characterized by NMR and IR spectroscopy as well as by MS spectrometry.
On the Reaction of Dithioarsonites, L‐As(SPh)2 (L = Ar, R), with Octasulfur in the Presence of Triethylamine as an Activator. The Crystal Structure of the Sesquisulfide (2‐O2N‐C6H4‐As)2S3
Authors: Terzis Aris , Ioannou Panayiotis V. 
Published: January 2004

AbstractOctasulfur (elemental sulfur) does not react at room temperature with a variety of AsIII compounds of the type Ar‐As(SPh)2 and R‐As(SPh)2. However, in the presence of catalytic amounts of triethylamine, which probably acts as an activator of octasulfur, reactions do take place. The products isolated from the aromatic dithioarsonites are not the expected Ar‐As(S)(SPh)2 but the sulfide, cyclo‐(PhAsS)4, and the sesquisulfides, (ArAs)2S3, which are the same with those obtained by reduction of arylarsonic acids with hydrogen sulfide. The action of S8/Et3N on aliphatic dithioarsonites did not give any AsV products but gave mixtures of non‐separable oligomeric (RAsS)x. Probable mechanistic routes for these reactions are proposed. The known cyclo‐(PhAsS)4 and (PhAs)2S3 and the new (2‐O2N‐C6H4‐As)2S3 have been structurally characterized: (2‐O2N‐C6H4‐As)2S3, monoclinic, C2/c, a = 13.564(9)Å, b = 7.982(6)Å, c = 16.67(1)Å, β = 117.63(2)°, V = 1599(2)Å3, Z = 4, wR2 0.0640. The 1, 4‐diarsa‐2, 3, 5‐trithiacyclopentane ring is puckered and the two AsIII atoms are pseudo tetrahedral.
N, N, N′, N′‐Tetrakis(diphenylphosphanyl)‐1, 3‐diaminobenzene as a Bis‐chelate Ligand in [1, 3‐{cis‐Mo(CO)4(PPh2)2N}2C6H4]
Authors: Majoumo Felicite , Lönnecke Peter , Kühl Olaf , Hey‐Hawkins Evamarie 
Published: January 2004

Abstract1, 3‐Diaminobenzene reacts readily with PPh2Cl to give N, N, N′, N′‐tetrakis(diphenylphosphanyl)‐1, 3‐diaminobenzene (1) in excellent yield. The dinuclear complex [1, 3‐{cis‐Mo(CO)4(PPh2)2N}2C6H4] (2) is obtained in high yield from 1 and cis‐[Mo(CO)4(NCEt)2]. Compounds 1 and 2 were characterized by NMR spectroscopy (1H, 13C, 31P) and by crystal structure determination. The latter shows the formation of a bis‐chelate complex with Mo‐P‐N‐P four‐membered rings.
Three Modifications of [Pr2(ClO4)2(H2I2O10)]·8 H2O — A Theme with Variations
Authors: Fischer Andreas 
Published: January 2004

AbstractFrom solutions containing praseodymium perchlorate and periodic acid, three different modifications of [Pr2(ClO4)2(H2I2O10)] · 8 H2O could be obtained. All of them crystallize in the monoclinic system, space group P21/c (α: a = 1091.47(6), b = 728.24(4), c = 1388.84(8) pm, β = 101.420(3)°; β: a = 1169.93(3), b = 728.72(2), c = 1384.50(4) pm, β = 112.303(2)°; γ: a = 1209.56(4), b = 712.53(2), c = 1361.64(5) pm, β = 115.691(1)°). The structures contain Pr3+ cations which are coordinated by [H2I2O10]4— anions yielding two‐dimensional networks. These networks are separated by ClO4— anions yielding a layered structure.
Solvothermal Syntheses and Characterization of Thiostannates [M(en)3]2Sn2S6 (M = Mn, Co, Zn), the Influence of Metal Ions on the Crystal Structure
Authors: Jia Ding‐Xian , Zhang Yong , Dai Jie , Zhu Qin‐Yu , Gu Xiao‐Mei 
Published: January 2004

AbstractThree new thiostannates [M(en)3]2Sn2S6 (en = ethylenediamine, M = Mn(1), Co(2) and Zn(3)) were synthesized by solvothermal method. The crystals were grown up in a Teflon‐lined steel autoclave at temperature about 180 °C. All the three compounds consist of discrete [Sn2S6]4— anions, which are dimer of two tetrahedral SnS4 sharing a common edge. The transition metal cations are six‐coordinated by three ethylenediamine molecules forming octahedral complex ions. Although the synthetic procedures, the mole ratio of the reactants and the solvent are essentially the same, the compound of MnII is quite different in structure from that of compounds of CoII and ZnII. Compound 1 crystallizes in monoclinic crystal system, C2/c, whereas compounds 2 and 3 crystallize in the orthorhombic crystal system, Pbca. Unlike compound 1, the [M(en)3]2+ cations in 2 and 3 are disordered. The difference of molecular packing between 1 and 2‐3 is considered due to the influence of the entities of the metal ions, such as radii and the coordination properties. The thermal chemical behaviors of the compounds 1‐3 were discussed and the results are also related to the property of the metal ions.
[Pt(Hmimt)4](NO3)2: Hydrogen Bonding Determines the Difference between the Structures of the Tetrakis[1‐methyl‐2(3H)‐imidazolinethione]platinum(II) Cation in its Chloride and Nitrate Salts
Authors: Calvo Josefa , Casas José S. , García‐Martínez Emilia , Parajó Yolanda , Sánchez‐González Angeles , Sordo José 
Published: January 2004

AbstractThe yellow‐orange crystals of [Pt(Hmimt)4](NO3)2 [Hmimt = 1‐methyl‐2(3H)‐imidazolinethione] are monoclinic [P21, a = 8.136(3), b = 13.978(4), c = 12.150(9)Å, β = 96.89(5)°]. They consist of [Pt(Hmimt)4]2+ cations and nitrate anions. In the cation the Pt atom is coordinated by four S atoms [Pt‐S: 2.291(5)‐2.357(5)Å] in a slightly distorted square planar arrangement.
Die ungewöhnliche Umwandlung von P(SnMe3)3 in P4(SnMe2)6
Authors: Fuhr Olaf , Fenske Dieter 
Published: January 2004

AbstractDas stannylierte Phosphan P(SnMe3)3 reagiert in Anwesenheit geringer Mengen von [(ZnCl)2Fe(CO)4(THF)2] in THF (Tetrahydrofuran) bei Raumtemperatur zu der äußerst schwerlöslichen Verbindung P4(SnMe2)6 (1). Diese kristallisiert direkt aus der Reaktionslösung in Form farbloser Nadeln (Raumgruppe Cmcm, a = 1593, 6(3) pm, b = 1118, 2(2), c = 1602, 5(3), Z = 4). Die Reaktion von ZnCl2 mit P(SnMe3)3 führt unter gleichen Reaktionsbedingungen nur zur Bildung des Komplexes [ZnCl2{P(SnMe3)3}THF] (2) (Raumgruppe Pccn, a = 1593, 6(3) pm, b = 1118, 2(2), c = 1602, 5(3), Z = 8).
Synthesen und Molekülstrukturen von [Cu20Ga10Cl4Se23(PEt2Ph)12] und [Cu14In6Se7(iPrSe)18]
Authors: Eichhöfer Andreas , Fenske Dieter , Olkowska‐Oetzel Jolanta 
Published: January 2004

AbstractCuCl und GaCl3 reagieren in THF mit Se(SiMe3)2 in Anwesenheit von PEt2Ph zu [Cu20Ga10Cl4Se23(PEt2Ph)12] (1). Die Reaktion von CuCl, InCl3 und TMEDA mit iPrSeSiMe3 führt in DME zur Bildung von [Cu14In6Se7(iPrSe)18] (2). Die Strukturen der Verbindungen 1 und 2 konnten durch Einkristall‐Röntgenstrukturanalyse aufgeklärt werden. Sie stellen zwei neue Strukturtypen von molekularen Clustern dar, die aus Elementen der Gruppen 11, 13 und 16 gebildet werden. Beide Molekülstrukturen zeigen allerdings keine Analogie zu den Festkörperstrukturen der entsprechenden ternären Verbindungen.
Synthesis, Crystal Structure, and Properties of a Binuclear Copper(II) Complex Containing an Oxalate Bridge
Authors: Bian He‐Dong , Tian Jin‐Lei , Liu Zhan‐Quan , Gu Wen , Xu Jing‐Yuan , Yan Shi‐Ping , Liao Dai‐Zheng , Jiang Zong‐Hui , Cheng Peng 
Published: January 2004

AbstractThe complex [Cu2(L)2(μ2‐C2O4)]·CH3OH (1) has been synthesized and characterized by IR, UV, ESR and variable temperature magnetic susceptibility measurement, where L = 1‐(ethylamino)‐2‐(salicylideneamino)ethane. The crystal X‐ray diffraction reveals that complex 1 has a μ2‐C2O42— bridge. The complex exhibits ferromagnetic couplings between the copper atoms bridged by oxalate dianion, which is rare in oxalato‐bridged copper complexes.
Über Münzmetall‐Quecksilber‐Chalkogenidhalogenide. IV1) Hydrothermalsynthese und Kristallstruktur von CuHgSI und CuHg2S2I
Authors: Keller Hans‐Lothar , Wimbert Lars 
Published: January 2004

AbstractAusgehend von CuI und α‐HgS fällt CuHgSI in verdünnter wässriger HI‐Lösung durch hydrothermale Umsetzung bei 180 °C in Form von dunkelroten Kristallen an. Die Verbindung kristallisiert orthorhombisch in der Raumgruppe Pna21 mit a = 718, 3(1) pm, b = 834, 3(2) pm und c = 698, 9(1) pm und vier Formeleinheiten pro Elementarzelle. CuHg2S2I kann durch hydrothermale Umsetzung von CuI und α‐HgS in verdünnter wässriger HI‐Lösung bei 300 °C in Form von schwarzen Kristallen dargestellt werden. Die Verbindung kristallisiert ebenfalls orthorhombisch in der Raumgruppe Cmc21 mit a = 1261, 8(3) pm, b = 722, 4(1) pm und c = 693, 7(1) pm sowie vier Formeleinheiten pro Elementarzelle. Beide Kristallstrukturen stellen Verzerrungsvarianten des Wurtzitstrukturtyps dar, wobei in beiden Fällen unterschiedliche Anionenteilgitter vorliegen.
Alkalimetalltetraethinylozincate und ‐cadmate AI2M(C2H)4 (AI = Na — Cs, M = Zn, Cd): Synthese, Kristallstruktur und spektroskopische Eigenschaften
Authors: Cremer Ulrich , Ruschewitz Uwe 
Published: January 2004

AbstractDurch Reaktion von AIC2H (AI = Na — Cs) mit zweiwertigen Zink‐ und Cadmium‐Salzen in flüssigem Ammoniak konnten die Alkalimetalltetraethinylozincate und ‐cadmate AI2M(C2H)4 (M = Zn, Cd) als polykristalline Pulver dargestellt werden. Während Na2M(C2H)4 röntgenamorph ist und die Kristallstruktur von Cs2Zn(C2H)4 bislang noch nicht aufgeklärt werden konnte, sind die restlichen Verbindungen nach Beugungsuntersuchungen am Pulver mit Röntgen‐ und Synchrotronstrahlung isotyp zu den strukturell bereits bekannten Kaliumverbindungen. Sie kristallisieren in der tetragonalen Raumgruppe I41/a, enthalten [M(C2H)4]2—‐Tetraeder und zeigen strukturelle Verwandtschaften zum Scheelit und Anatas. Raman‐spektroskopische Untersuchungen belegen das Vorliegen eines Tetraederfragmentes mit C‐C‐Dreifachbindungen in den Alkalimetall‐ wie auch in den röntgenamorphen Erdalkalimetallverbindungen AIIM(C2H)4 (AII = Mg — Ba, M = Zn, Cd).