1. Process Chemistry Centre, Forest Products Chemistry, Åbo Akademi University, Porthansgatan 3, FIN-20500 Turku/Åbo, Finland, MCA Research Laboratory, BioCity B 4, Tykistökatu 6B, FIN-20520 Turku/Åbo, Finland, and Process Chemistry Centre, Department of Organic Chemistry, Biskopsgatan 8, FIN-20500 Turku/Åbo, Finland