Das Tetrachlorethyl‐isocyanat (II) reagiert mit Diethyl‐chlorphosphit (I) zu einem durch Fraktionierung trennbaren Gemisch der Isocyanate (III) und (IV).

Chlormethyliso‐ cyanat (II) reagiert mit den tert. Aminen (I) zu den Ammoniumchloriden (III).

Triarylphosphine (I) und Chlormethylisocyanat (II) reagieren zu den monomeren, kristallinen, in Äther unlöslichen Triaryl‐(isocyanatomethyl)‐chlorphosphoranen (III).

Aus 1 Mol Dichlormethylisocyanat (I) und 1 Mo1Triäthylphosphit (II) entsteht bei 70 ‐ 75°C Diäthoxyphosphonylchlormethylisocyanat (III) mit geringer Ausbeute, wobei es unerheblich ist, ob mit oder ohne Lösungsmittel (Toluol) und mit oder ohne Katalysator (wasserfreies Eisenchlorid) gearbeitet wird.

Dihalogenphosphite (I) und (V) setzen sich in Gegenwart von Eisen‐ (III)‐chlorid mit Alkylestern der Alkoxy‐chloressigsäure (II) zu Alkylestern der Alkoxy‐(dihalogenphosphonyl)‐essigsäuren (IIIa) und (IIIb) bzw. (VIa) und (VIb) um.

The analysis of spatially resolved Xe(L) spectra obtained with Z−λ imaging reveals two prominent findings concerning the characteristics of the x-ray amplification occurring in self-trapped plasma channels formed by the focusing of multi-TW subpicosecond 248 nm laser pulses into a high-density gaseous Xe cluster target. They are (1) strongly saturated amplification across both lobes of the Xe(L) hollow atom 3d → 2p emission profile, a breadth that spans a spectral width of ∼600 eV, and (2) new evidence for the formation of x-ray spatial modes based on the signature of the transversely observed emission from the narrow trapped zone of the channel. The global characteristics of the spectral measurements, in concert with prior analyses of the strength of the amplification, indicate that the enhancement of the x-ray emission rate by intra-cluster superradiant dynamics plays a leading role in the amplification. This radiative interaction simultaneously promotes (a) a sharp boost in the effective gain, (b) the directly consequent efficient production of coherent Xe(L) x-rays from both single (2p) and double (2s2p) vacancy 3d → 2p transition arrays, estimated herein at ∼30%, and (c) the development of a very short x-ray pulse width τ x . In the limit of sufficiently strong superradiant coupling in the cluster, the system assumes a dynamically collective character and acts as a single homogeneously broadened transition whose effective radiative width approaches the full Xe(L) bandwidth, a breadth that establishes a potential lower limit of τ x ∼5-10 as, a value substantially less than the canonical atomic time a o /αc ∼ = 24 as.

Curtius degradation of the azides obtained in situ from the carboxylic chlorides (I) produces the isocyanates (II).

Aus. dem Triphenyl‐(isocyanatomethyl)‐phosphoniumchlorid (I) und Iodmethan bildet sich das ′Phosphonium‐iodid (IIIa).