Zur titrimetrischen Bestimmung von Blei- Organoverbindungen

Hein, Fr.; Klein, Adolf; Mesée, H. J.

doi:10.1007/bf01675761

Cited by 7 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Et4Pb + I2 -> EtsPbl + EtI (26,36,64) have been the basis for several analytical procedures for TEL, since these reactions proceed quantitatively.…”

Section: Reaction With Halogensmentioning

confidence: 99%

Chemical Reactions of Tetraethyllead

Milde¹,

Beatty²

1959

Metal-Organic Compounds

View full text Add to dashboard Cite

This report gives a compilation of the periodical and patent literature on the known chemical reactions of tetraethyllead (TEL). These are by no means con fined to antioxidant and antiknock effects. Of par ticular interest are those reactions wherein ethyl radicals, liberated from TEL by photolysis or pyrolysis, induce the polymerization, chlorination, or oxidation of other compounds. Many different diethyl-and triethyllead salts are readily obtained from the parent compound. TEL is used to prepare other organome tallic compounds, and its reaction with heavy metal chlorides produces Ziegler-type catalysts for the polymerization of olefins. In view of its ready avail ability, these relatively unexplored end uses for TEL constitute an area of considerable research potential.Tetraethyllead-commonly abbreviated to TEL-is the outstanding example of the simple or R n M type of organometallic compound of moderate chemical reactivity. It has been known for over 100 years, as it was one of the first of these compounds to be isolated, and it is now unique in industrial importance. As a consequence, the reac tions of TEL have been widely investigated. However, there still remain many oppor tunities for worthwhile research in this field.The chemistry of organolead compounds in general has often been reviewed (58,113,120), notably by Calingaert (17), Krause (82), and most recently Gilman (45,83) and their coworkers: men who have contributed much of the important ex perimental work on the subject. Reviews in particular have been made by German and Russian workers (81, 131), but these are not readily accessible and are now out of date.Considering the variety of chemical reactions into which TEL can enter, and its ready availability at a relatively low cost, there may well be good use for the follow ing compilation of the available information on these reactions. PhotolysisTEL is readily dissociated by light. The vapor shows continuous absorption in the ultraviolet with the formation of metallic lead and ethyl radicals, the latter being detected by the Paneth method (33, 103, 124) · Maximum absorption occurs at about 306

show abstract

“…Et4Pb + I2 -> EtsPbl + EtI (26,36,64) have been the basis for several analytical procedures for TEL, since these reactions proceed quantitatively.…”

Section: Reaction With Halogensmentioning

confidence: 99%

Chemical Reactions of Tetraethyllead

Milde¹,

Beatty²

1959

Metal-Organic Compounds

View full text Add to dashboard Cite

show abstract

Deutsche Chemische Gesellschaft

1939

Angewandte Chemie

View full text Add to dashboard Cite

Auaapraehr: Marsh: Der Apparatebauer aollte r h r genau darad d e n , wle ein Apparat benutzt wird. MiOerfolge bei Kontrollvorrichtungm k h e u auf UnZmcLmllBiger Konstruktion der xu kootrollkrcnden Aolage beruheo. -Oft IUt sich mit Vorteil dn p & r Tdl der atorderlichen Kontrolle vou Haod durchfiihren und nur d k Pdndnrkll~~g automatisch ksorgen. Zur Fbrderung d a ELnfiihrrurg automatiticha Kontrollvodchtungen in der Textilindastrte aollte dch daher der Tdtechuiker beim Bau einer Anlam mit dan Apperatebaner m6glichst eingehend dariiber rer-sUindlgcn, In welchem Umfaoge die automatische Kontrolle peafinrcht rrird and zweckmloig ist. Dr. C. G. Darwin, National Wysical Lab., Teddington: ,, Wdnncan'rkungcn bci F a s m und andcrcn Systcmcn." Vcutr. bespricht die theoretischen Crundlagen und die Methoden der Erzeugung tiefer Temperaturen und geht dann auf den Einfld der Temperatur auf die mechanisch-elastischen Eigenschaften von Stahl einerseits und von Kautscbuk als anderem Extrem ein. Kautschuk hat die erstaunliche Eigenschaft. sich in gewisscmSinne wie dn idealescas zu verhalten; die Kuhnsche Theoriel) ermi5glicht. die Beziehung zwischm Entropie und Wahrscheinlichkdt physikalisch zu verstehen. Bd Wolle ergaben Messungen von Aslbury, daI3 der Youngsche Modul d a abaoluten Temperatur etwa umgekehrt proportional ist. Vortr. er6rta-t &en Dehnungmechanismus, der zu einer solchen Abhangigkdt ftihrt.

show abstract