Diethylzinc solution

GeI₂ (99.99%) was purchased from ABCR, tri-n-octylphosphine (TOP, 97%) and Te (broken ingots, 99.999%) from STREM, oleic acid (90%), chloroform (99%), ethanol (99.8%), diethylzinc solution (1.0 M in hexanes), sulfur (99.98%) from Sigma-Aldrich, lithium bis(trimethylsilyl)amide (LiN(SiMe₃)₂, 95%) from Acros Organics. Oleic acid was dried at 100 C for 1 hour from water residues and all other chemicals were of anhydrous grade and were used as received. Anhydrous boron nitride (BN) from Alfa Aesar was dried under vacuum in a squalene oil bath at 250 °C for 24 h.

All experiments were performed under nitrogen in a glove box or by classical Schlenk-line techniques. Nitrogen and ethylene gases were purified by passage through BTS catalyst, molecular sieves and CaCl₂. Toluene used as reaction solvent was purified by distillation from Na prior use. C₂D₂Cl₄ (99.9% of D), norbornene (98%), diethylzinc solution (10 wt % in toluene), and triisobutylaluminum (TIBA neat) were purchased from Sigma Aldrich (St. Louis, MO, USA). norbornene was distilled from Na, and used as toluene stock solution. diethylzinc solution was handled in a glove box. Metallocenes 1 (isopropyliden(η⁵-cyclopentadienyl)(η⁵-indenyl)zirconium dichloride) and 2 (isopropyliden(η⁵-3-methylcyclopentadienyl)(η⁵-fluorenyl)zirconium dichloride), and dimethylanilinium tetrakis(pentafluorophenyl)borate were obtained from TOPAS Advanced Polymers GmbH, Frankfurt, Germany. Hydrochloric acid (Sigma Aldrich; 37% m/m) was used as received.

Diethylzinc solution (1.0 M in hexane), zinc acetate (anhydrous, 99.99%), zinc oxide (ZnO, 99.0%), 1-octadecene (ODE, 90%), oleic acid (OA, 90%), selenium (99.99%), 1-octanethiol (≥98.5%), oleylamine (OLA, 70%), cadmium oxide (CdO, ≥99.99%), trioctylphosphine oxide (TOPO, 99%), diphenylphosphine (DPP, 98%), tetrakis(acetonitrile)copper(I) hexafluorophosphate (97%) and zinc chloride (dry, ≥98.5%) were purchased from Sigma. Trioctylphosphine (TOP, 97%) was purchased from Strem. Octadecylphosphonic acid (ODPA, >99%), tetradecylphosphonic acid (TDPA, >99%) and hexylphosphonic acid (HPA, >99%) were purchased from PCI synthesis. All chemicals were used as received without any further purification.