General procedure of NaHBEt3-catalysed hydroboration 1.0 mmol of alkyne, 0.1 mL of decane and 1.1 mmol of pinacolborane, were placed in previously evacuated Schlenk bomb flask fitted with a plug valve. A reference sample was taken. Next, 0.1 mL of 1M solution of NaHBEt3 (0.1 mmol) in toluene was added, reaction vessel was closed and heated at 60 °C with stirring. After specified time, reaction mixture was cooled down to the room temperature and analysed using GC and GC-MS. Products of hydroboration were isolated by extraction with 1 mL of DCM followed by column chromatography of concentrated extract (SiO2, hexane/Et2O, 98:2). )